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|000042b0| 3c 20 30 29 0a 09 20 20 | 20 20 70 66 61 74 61 6c |< 0)..  |  pfatal|
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|00004c70| 69 73 20 70 61 72 74 20 | 6f 66 20 47 4e 55 20 44 |is part |of GNU D|
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|00004e70| 65 20 47 4e 55 20 47 65 | 6e 65 72 61 6c 20 50 75 |e GNU Ge|neral Pu|
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|00004e90| 6e 67 20 77 69 74 68 20 | 47 4e 55 20 44 49 46 46 |ng with |GNU DIFF|
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|00004f10| 20 2a 2f 0a 0a 2f 2a 20 | 54 68 65 20 62 61 73 69 | */../* |The basi|
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|00004f30| 65 73 63 72 69 62 65 64 | 20 69 6e 3a 20 0a 20 20 |escribed| in: .  |
|00004f40| 20 22 41 6e 20 4f 28 4e | 44 29 20 44 69 66 66 65 | "An O(N|D) Diffe|
|00004f50| 72 65 6e 63 65 20 41 6c | 67 6f 72 69 74 68 6d 20 |rence Al|gorithm |
|00004f60| 61 6e 64 20 69 74 73 20 | 56 61 72 69 61 74 69 6f |and its |Variatio|
|00004f70| 6e 73 22 2c 20 45 75 67 | 65 6e 65 20 4d 79 65 72 |ns", Eug|ene Myer|
|00004f80| 73 2c 0a 20 20 20 41 6c | 67 6f 72 69 74 68 6d 69 |s,.   Al|gorithmi|
|00004f90| 63 61 20 56 6f 6c 2e 20 | 31 20 4e 6f 2e 20 32 2c |ca Vol. |1 No. 2,|
|00004fa0| 20 31 39 38 36 2c 20 70 | 20 32 35 31 2e 20 20 2a | 1986, p| 251.  *|
|00004fb0| 2f 0a 0a 23 69 6e 63 6c | 75 64 65 20 22 64 69 66 |/..#incl|ude "dif|
|00004fc0| 66 2e 68 22 0a 0a 73 74 | 72 75 63 74 20 63 68 61 |f.h"..st|ruct cha|
|00004fd0| 6e 67 65 20 2a 66 69 6e | 64 5f 63 68 61 6e 67 65 |nge *fin|d_change|
|00004fe0| 20 28 29 3b 0a 76 6f 69 | 64 20 66 69 6e 69 73 68 | ();.voi|d finish|
|00004ff0| 5f 6f 75 74 70 75 74 20 | 28 29 3b 0a 76 6f 69 64 |_output |();.void|
|00005000| 20 70 72 69 6e 74 5f 63 | 6f 6e 74 65 78 74 5f 68 | print_c|ontext_h|
|00005010| 65 61 64 65 72 20 28 29 | 3b 0a 76 6f 69 64 20 70 |eader ()|;.void p|
|00005020| 72 69 6e 74 5f 63 6f 6e | 74 65 78 74 5f 73 63 72 |rint_con|text_scr|
|00005030| 69 70 74 20 28 29 3b 0a | 76 6f 69 64 20 70 72 69 |ipt ();.|void pri|
|00005040| 6e 74 5f 65 64 5f 73 63 | 72 69 70 74 20 28 29 3b |nt_ed_sc|ript ();|
|00005050| 0a 76 6f 69 64 20 70 72 | 69 6e 74 5f 69 66 64 65 |.void pr|int_ifde|
|00005060| 66 5f 73 63 72 69 70 74 | 20 28 29 3b 0a 76 6f 69 |f_script| ();.voi|
|00005070| 64 20 70 72 69 6e 74 5f | 6e 6f 72 6d 61 6c 5f 73 |d print_|normal_s|
|00005080| 63 72 69 70 74 20 28 29 | 3b 0a 76 6f 69 64 20 70 |cript ()|;.void p|
|00005090| 72 69 6e 74 5f 72 63 73 | 5f 73 63 72 69 70 74 20 |rint_rcs|_script |
|000050a0| 28 29 3b 0a 76 6f 69 64 | 20 70 72 5f 66 6f 72 77 |();.void| pr_forw|
|000050b0| 61 72 64 5f 65 64 5f 73 | 63 72 69 70 74 20 28 29 |ard_ed_s|cript ()|
|000050c0| 3b 0a 76 6f 69 64 20 73 | 65 74 75 70 5f 6f 75 74 |;.void s|etup_out|
|000050d0| 70 75 74 20 28 29 3b 0a | 0a 65 78 74 65 72 6e 20 |put ();.|.extern |
|000050e0| 69 6e 74 20 6e 6f 5f 64 | 69 73 63 61 72 64 73 3b |int no_d|iscards;|
|000050f0| 0a 0a 73 74 61 74 69 63 | 20 69 6e 74 20 2a 78 76 |..static| int *xv|
|00005100| 65 63 2c 20 2a 79 76 65 | 63 3b 09 2f 2a 20 56 65 |ec, *yve|c;./* Ve|
|00005110| 63 74 6f 72 73 20 62 65 | 69 6e 67 20 63 6f 6d 70 |ctors be|ing comp|
|00005120| 61 72 65 64 2e 20 2a 2f | 0a 73 74 61 74 69 63 20 |ared. */|.static |
|00005130| 69 6e 74 20 2a 66 64 69 | 61 67 3b 09 09 2f 2a 20 |int *fdi|ag;../* |
|00005140| 56 65 63 74 6f 72 2c 20 | 69 6e 64 65 78 65 64 20 |Vector, |indexed |
|00005150| 62 79 20 64 69 61 67 6f | 6e 61 6c 2c 20 63 6f 6e |by diago|nal, con|
|00005160| 74 61 69 6e 69 6e 67 0a | 09 09 09 09 20 20 20 74 |taining.|....   t|
|00005170| 68 65 20 58 20 63 6f 6f | 72 64 69 6e 61 74 65 20 |he X coo|rdinate |
|00005180| 6f 66 20 74 68 65 20 70 | 6f 69 6e 74 20 66 75 72 |of the p|oint fur|
|00005190| 74 68 65 73 74 0a 09 09 | 09 09 20 20 20 61 6c 6f |thest...|..   alo|
|000051a0| 6e 67 20 74 68 65 20 67 | 69 76 65 6e 20 64 69 61 |ng the g|iven dia|
|000051b0| 67 6f 6e 61 6c 20 69 6e | 20 74 68 65 20 66 6f 72 |gonal in| the for|
|000051c0| 77 61 72 64 0a 09 09 09 | 09 20 20 20 73 65 61 72 |ward....|.   sear|
|000051d0| 63 68 20 6f 66 20 74 68 | 65 20 65 64 69 74 20 6d |ch of th|e edit m|
|000051e0| 61 74 72 69 78 2e 20 2a | 2f 0a 73 74 61 74 69 63 |atrix. *|/.static|
|000051f0| 20 69 6e 74 20 2a 62 64 | 69 61 67 3b 09 09 2f 2a | int *bd|iag;../*|
|00005200| 20 56 65 63 74 6f 72 2c | 20 69 6e 64 65 78 65 64 | Vector,| indexed|
|00005210| 20 62 79 20 64 69 61 67 | 6f 6e 61 6c 2c 20 63 6f | by diag|onal, co|
|00005220| 6e 74 61 69 6e 69 6e 67 | 0a 09 09 09 09 20 20 20 |ntaining|.....   |
|00005230| 74 68 65 20 58 20 63 6f | 6f 72 64 69 6e 61 74 65 |the X co|ordinate|
|00005240| 20 6f 66 20 74 68 65 20 | 70 6f 69 6e 74 20 66 75 | of the |point fu|
|00005250| 72 74 68 65 73 74 0a 09 | 09 09 09 20 20 20 61 6c |rthest..|...   al|
|00005260| 6f 6e 67 20 74 68 65 20 | 67 69 76 65 6e 20 64 69 |ong the |given di|
|00005270| 61 67 6f 6e 61 6c 20 69 | 6e 20 74 68 65 20 62 61 |agonal i|n the ba|
|00005280| 63 6b 77 61 72 64 0a 09 | 09 09 09 20 20 20 73 65 |ckward..|...   se|
|00005290| 61 72 63 68 20 6f 66 20 | 74 68 65 20 65 64 69 74 |arch of |the edit|
|000052a0| 20 6d 61 74 72 69 78 2e | 20 2a 2f 0a 0a 2f 2a 20 | matrix.| */../* |
|000052b0| 46 69 6e 64 20 74 68 65 | 20 6d 69 64 70 6f 69 6e |Find the| midpoin|
|000052c0| 74 20 6f 66 20 74 68 65 | 20 73 68 6f 72 74 65 73 |t of the| shortes|
|000052d0| 74 20 65 64 69 74 20 73 | 63 72 69 70 74 20 66 6f |t edit s|cript fo|
|000052e0| 72 20 61 20 73 70 65 63 | 69 66 69 65 64 0a 20 20 |r a spec|ified.  |
|000052f0| 20 70 6f 72 74 69 6f 6e | 20 6f 66 20 74 68 65 20 | portion| of the |
|00005300| 74 77 6f 20 66 69 6c 65 | 73 2e 0a 0a 20 20 20 57 |two file|s...   W|
|00005310| 65 20 73 63 61 6e 20 66 | 72 6f 6d 20 74 68 65 20 |e scan f|rom the |
|00005320| 62 65 67 69 6e 6e 69 6e | 67 73 20 6f 66 20 74 68 |beginnin|gs of th|
|00005330| 65 20 66 69 6c 65 73 2c | 20 61 6e 64 20 73 69 6d |e files,| and sim|
|00005340| 75 6c 74 61 6e 65 6f 75 | 73 6c 79 20 66 72 6f 6d |ultaneou|sly from|
|00005350| 20 74 68 65 20 65 6e 64 | 73 2c 0a 20 20 20 64 6f | the end|s,.   do|
|00005360| 69 6e 67 20 61 20 62 72 | 65 61 64 74 68 2d 66 69 |ing a br|eadth-fi|
|00005370| 72 73 74 20 73 65 61 72 | 63 68 20 74 68 72 6f 75 |rst sear|ch throu|
|00005380| 67 68 20 74 68 65 20 73 | 70 61 63 65 20 6f 66 20 |gh the s|pace of |
|00005390| 65 64 69 74 2d 73 65 71 | 75 65 6e 63 65 2e 0a 20 |edit-seq|uence.. |
|000053a0| 20 20 57 68 65 6e 20 74 | 68 65 20 74 77 6f 20 73 |  When t|he two s|
|000053b0| 65 61 72 63 68 65 73 20 | 6d 65 65 74 2c 20 77 65 |earches |meet, we|
|000053c0| 20 68 61 76 65 20 66 6f | 75 6e 64 20 74 68 65 20 | have fo|und the |
|000053d0| 6d 69 64 70 6f 69 6e 74 | 20 6f 66 20 74 68 65 20 |midpoint| of the |
|000053e0| 73 68 6f 72 74 65 73 74 | 0a 20 20 20 65 64 69 74 |shortest|.   edit|
|000053f0| 20 73 65 71 75 65 6e 63 | 65 2e 0a 0a 20 20 20 54 | sequenc|e...   T|
|00005400| 68 65 20 76 61 6c 75 65 | 20 72 65 74 75 72 6e 65 |he value| returne|
|00005410| 64 20 69 73 20 74 68 65 | 20 6e 75 6d 62 65 72 20 |d is the| number |
|00005420| 6f 66 20 74 68 65 20 64 | 69 61 67 6f 6e 61 6c 20 |of the d|iagonal |
|00005430| 6f 6e 20 77 68 69 63 68 | 20 74 68 65 20 6d 69 64 |on which| the mid|
|00005440| 70 6f 69 6e 74 20 6c 69 | 65 73 2e 0a 20 20 20 54 |point li|es..   T|
|00005450| 68 65 20 64 69 61 67 6f | 6e 61 6c 20 6e 75 6d 62 |he diago|nal numb|
|00005460| 65 72 20 65 71 75 61 6c | 73 20 74 68 65 20 6e 75 |er equal|s the nu|
|00005470| 6d 62 65 72 20 6f 66 20 | 69 6e 73 65 72 74 65 64 |mber of |inserted|
|00005480| 20 6c 69 6e 65 73 20 6d | 69 6e 75 73 20 74 68 65 | lines m|inus the|
|00005490| 20 6e 75 6d 62 65 72 0a | 20 20 20 6f 66 20 64 65 | number.|   of de|
|000054a0| 6c 65 74 65 64 20 6c 69 | 6e 65 73 20 28 63 6f 75 |leted li|nes (cou|
|000054b0| 6e 74 69 6e 67 20 6f 6e | 6c 79 20 6c 69 6e 65 73 |nting on|ly lines|
|000054c0| 20 62 65 66 6f 72 65 20 | 74 68 65 20 6d 69 64 70 | before |the midp|
|000054d0| 6f 69 6e 74 29 2e 0a 20 | 20 20 54 68 65 20 65 64 |oint).. |  The ed|
|000054e0| 69 74 20 63 6f 73 74 20 | 69 73 20 73 74 6f 72 65 |it cost |is store|
|000054f0| 64 20 69 6e 74 6f 20 2a | 43 4f 53 54 3b 20 74 68 |d into *|COST; th|
|00005500| 69 73 20 69 73 20 74 68 | 65 20 74 6f 74 61 6c 20 |is is th|e total |
|00005510| 6e 75 6d 62 65 72 20 6f | 66 0a 20 20 20 6c 69 6e |number o|f.   lin|
|00005520| 65 73 20 69 6e 73 65 72 | 74 65 64 20 6f 72 20 64 |es inser|ted or d|
|00005530| 65 6c 65 74 65 64 20 28 | 63 6f 75 6e 74 69 6e 67 |eleted (|counting|
|00005540| 20 6f 6e 6c 79 20 6c 69 | 6e 65 73 20 62 65 66 6f | only li|nes befo|
|00005550| 72 65 20 74 68 65 20 6d | 69 64 70 6f 69 6e 74 29 |re the m|idpoint)|
|00005560| 2e 0a 0a 20 20 20 54 68 | 69 73 20 66 75 6e 63 74 |...   Th|is funct|
|00005570| 69 6f 6e 20 61 73 73 75 | 6d 65 73 20 74 68 61 74 |ion assu|mes that|
|00005580| 20 74 68 65 20 66 69 72 | 73 74 20 6c 69 6e 65 73 | the fir|st lines|
|00005590| 20 6f 66 20 74 68 65 20 | 73 70 65 63 69 66 69 65 | of the |specifie|
|000055a0| 64 20 70 6f 72 74 69 6f | 6e 73 0a 20 20 20 6f 66 |d portio|ns.   of|
|000055b0| 20 74 68 65 20 74 77 6f | 20 66 69 6c 65 73 20 64 | the two| files d|
|000055c0| 6f 20 6e 6f 74 20 6d 61 | 74 63 68 2c 20 61 6e 64 |o not ma|tch, and|
|000055d0| 20 6c 69 6b 65 77 69 73 | 65 20 74 68 61 74 20 74 | likewis|e that t|
|000055e0| 68 65 20 6c 61 73 74 20 | 6c 69 6e 65 73 20 64 6f |he last |lines do|
|000055f0| 20 6e 6f 74 0a 20 20 20 | 6d 61 74 63 68 2e 20 20 | not.   |match.  |
|00005600| 54 68 65 20 63 61 6c 6c | 65 72 20 6d 75 73 74 20 |The call|er must |
|00005610| 74 72 69 6d 20 6d 61 74 | 63 68 69 6e 67 20 6c 69 |trim mat|ching li|
|00005620| 6e 65 73 20 66 72 6f 6d | 20 74 68 65 20 62 65 67 |nes from| the beg|
|00005630| 69 6e 6e 69 6e 67 20 61 | 6e 64 20 65 6e 64 0a 20 |inning a|nd end. |
|00005640| 20 20 6f 66 20 74 68 65 | 20 70 6f 72 74 69 6f 6e |  of the| portion|
|00005650| 73 20 69 74 20 69 73 20 | 67 6f 69 6e 67 20 74 6f |s it is |going to|
|00005660| 20 73 70 65 63 69 66 79 | 2e 0a 0a 20 20 20 4e 6f | specify|...   No|
|00005670| 74 65 20 74 68 61 74 20 | 69 66 20 77 65 20 72 65 |te that |if we re|
|00005680| 74 75 72 6e 20 74 68 65 | 20 22 77 72 6f 6e 67 22 |turn the| "wrong"|
|00005690| 20 64 69 61 67 6f 6e 61 | 6c 20 76 61 6c 75 65 2c | diagona|l value,|
|000056a0| 20 6f 72 20 69 66 0a 20 | 20 20 74 68 65 20 76 61 | or if. |  the va|
|000056b0| 6c 75 65 20 6f 66 20 62 | 64 69 61 67 20 61 74 20 |lue of b|diag at |
|000056c0| 74 68 61 74 20 64 69 61 | 67 6f 6e 61 6c 20 69 73 |that dia|gonal is|
|000056d0| 20 22 77 72 6f 6e 67 22 | 2c 0a 20 20 20 74 68 65 | "wrong"|,.   the|
|000056e0| 20 77 6f 72 73 74 20 74 | 68 69 73 20 63 61 6e 20 | worst t|his can |
|000056f0| 64 6f 20 69 73 20 63 61 | 75 73 65 20 73 75 62 6f |do is ca|use subo|
|00005700| 70 74 69 6d 61 6c 20 64 | 69 66 66 20 6f 75 74 70 |ptimal d|iff outp|
|00005710| 75 74 2e 0a 20 20 20 49 | 74 20 63 61 6e 6e 6f 74 |ut..   I|t cannot|
|00005720| 20 63 61 75 73 65 20 69 | 6e 63 6f 72 72 65 63 74 | cause i|ncorrect|
|00005730| 20 64 69 66 66 20 6f 75 | 74 70 75 74 2e 20 20 2a | diff ou|tput.  *|
|00005740| 2f 0a 0a 73 74 61 74 69 | 63 20 69 6e 74 0a 64 69 |/..stati|c int.di|
|00005750| 61 67 20 28 78 6f 66 66 | 2c 20 78 6c 69 6d 2c 20 |ag (xoff|, xlim, |
|00005760| 79 6f 66 66 2c 20 79 6c | 69 6d 2c 20 63 6f 73 74 |yoff, yl|im, cost|
|00005770| 29 0a 20 20 20 20 20 69 | 6e 74 20 78 6f 66 66 2c |).     i|nt xoff,|
|00005780| 20 78 6c 69 6d 2c 20 79 | 6f 66 66 2c 20 79 6c 69 | xlim, y|off, yli|
|00005790| 6d 3b 0a 20 20 20 20 20 | 69 6e 74 20 2a 63 6f 73 |m;.     |int *cos|
|000057a0| 74 3b 0a 7b 0a 20 20 69 | 6e 74 20 2a 63 6f 6e 73 |t;.{.  i|nt *cons|
|000057b0| 74 20 66 64 20 3d 20 66 | 64 69 61 67 3b 09 2f 2a |t fd = f|diag;./*|
|000057c0| 20 47 69 76 65 20 74 68 | 65 20 63 6f 6d 70 69 6c | Give th|e compil|
|000057d0| 65 72 20 61 20 63 68 61 | 6e 63 65 2e 20 2a 2f 0a |er a cha|nce. */.|
|000057e0| 20 20 69 6e 74 20 2a 63 | 6f 6e 73 74 20 62 64 20 |  int *c|onst bd |
|000057f0| 3d 20 62 64 69 61 67 3b | 09 2f 2a 20 41 64 64 69 |= bdiag;|./* Addi|
|00005800| 74 69 6f 6e 61 6c 20 68 | 65 6c 70 20 66 6f 72 20 |tional h|elp for |
|00005810| 74 68 65 20 63 6f 6d 70 | 69 6c 65 72 2e 20 2a 2f |the comp|iler. */|
|00005820| 0a 20 20 69 6e 74 20 2a | 63 6f 6e 73 74 20 78 76 |.  int *|const xv|
|00005830| 20 3d 20 78 76 65 63 3b | 09 09 2f 2a 20 53 74 69 | = xvec;|../* Sti|
|00005840| 6c 6c 20 6d 6f 72 65 20 | 68 65 6c 70 20 66 6f 72 |ll more |help for|
|00005850| 20 74 68 65 20 63 6f 6d | 70 69 6c 65 72 2e 20 2a | the com|piler. *|
|00005860| 2f 0a 20 20 69 6e 74 20 | 2a 63 6f 6e 73 74 20 79 |/.  int |*const y|
|00005870| 76 20 3d 20 79 76 65 63 | 3b 09 09 2f 2a 20 41 6e |v = yvec|;../* An|
|00005880| 64 20 6d 6f 72 65 20 61 | 6e 64 20 6d 6f 72 65 20 |d more a|nd more |
|00005890| 2e 20 2e 20 2e 20 2a 2f | 0a 20 20 63 6f 6e 73 74 |. . . */|.  const|
|000058a0| 20 69 6e 74 20 64 6d 69 | 6e 20 3d 20 78 6f 66 66 | int dmi|n = xoff|
|000058b0| 20 2d 20 79 6c 69 6d 3b | 09 2f 2a 20 4d 69 6e 69 | - ylim;|./* Mini|
|000058c0| 6d 75 6d 20 76 61 6c 69 | 64 20 64 69 61 67 6f 6e |mum vali|d diagon|
|000058d0| 61 6c 2e 20 2a 2f 0a 20 | 20 63 6f 6e 73 74 20 69 |al. */. | const i|
|000058e0| 6e 74 20 64 6d 61 78 20 | 3d 20 78 6c 69 6d 20 2d |nt dmax |= xlim -|
|000058f0| 20 79 6f 66 66 3b 09 2f | 2a 20 4d 61 78 69 6d 75 | yoff;./|* Maximu|
|00005900| 6d 20 76 61 6c 69 64 20 | 64 69 61 67 6f 6e 61 6c |m valid |diagonal|
|00005910| 2e 20 2a 2f 0a 20 20 63 | 6f 6e 73 74 20 69 6e 74 |. */.  c|onst int|
|00005920| 20 66 6d 69 64 20 3d 20 | 78 6f 66 66 20 2d 20 79 | fmid = |xoff - y|
|00005930| 6f 66 66 3b 09 2f 2a 20 | 43 65 6e 74 65 72 20 64 |off;./* |Center d|
|00005940| 69 61 67 6f 6e 61 6c 20 | 6f 66 20 74 6f 70 2d 64 |iagonal |of top-d|
|00005950| 6f 77 6e 20 73 65 61 72 | 63 68 2e 20 2a 2f 0a 20 |own sear|ch. */. |
|00005960| 20 63 6f 6e 73 74 20 69 | 6e 74 20 62 6d 69 64 20 | const i|nt bmid |
|00005970| 3d 20 78 6c 69 6d 20 2d | 20 79 6c 69 6d 3b 09 2f |= xlim -| ylim;./|
|00005980| 2a 20 43 65 6e 74 65 72 | 20 64 69 61 67 6f 6e 61 |* Center| diagona|
|00005990| 6c 20 6f 66 20 62 6f 74 | 74 6f 6d 2d 75 70 20 73 |l of bot|tom-up s|
|000059a0| 65 61 72 63 68 2e 20 2a | 2f 0a 20 20 69 6e 74 20 |earch. *|/.  int |
|000059b0| 66 6d 69 6e 20 3d 20 66 | 6d 69 64 2c 20 66 6d 61 |fmin = f|mid, fma|
|000059c0| 78 20 3d 20 66 6d 69 64 | 3b 09 2f 2a 20 4c 69 6d |x = fmid|;./* Lim|
|000059d0| 69 74 73 20 6f 66 20 74 | 6f 70 2d 64 6f 77 6e 20 |its of t|op-down |
|000059e0| 73 65 61 72 63 68 2e 20 | 2a 2f 0a 20 20 69 6e 74 |search. |*/.  int|
|000059f0| 20 62 6d 69 6e 20 3d 20 | 62 6d 69 64 2c 20 62 6d | bmin = |bmid, bm|
|00005a00| 61 78 20 3d 20 62 6d 69 | 64 3b 09 2f 2a 20 4c 69 |ax = bmi|d;./* Li|
|00005a10| 6d 69 74 73 20 6f 66 20 | 62 6f 74 74 6f 6d 2d 75 |mits of |bottom-u|
|00005a20| 70 20 73 65 61 72 63 68 | 2e 20 2a 2f 0a 20 20 69 |p search|. */.  i|
|00005a30| 6e 74 20 63 3b 09 09 09 | 2f 2a 20 43 6f 73 74 2e |nt c;...|/* Cost.|
|00005a40| 20 2a 2f 0a 20 20 69 6e | 74 20 6f 64 64 20 3d 20 | */.  in|t odd = |
|00005a50| 66 6d 69 64 20 2d 20 62 | 6d 69 64 20 26 20 31 3b |fmid - b|mid & 1;|
|00005a60| 09 2f 2a 20 54 72 75 65 | 20 69 66 20 73 6f 75 74 |./* True| if sout|
|00005a70| 68 65 61 73 74 20 63 6f | 72 6e 65 72 20 69 73 20 |heast co|rner is |
|00005a80| 6f 6e 20 61 6e 20 6f 64 | 64 0a 09 09 09 09 20 20 |on an od|d.....  |
|00005a90| 20 64 69 61 67 6f 6e 61 | 6c 20 77 69 74 68 20 72 | diagona|l with r|
|00005aa0| 65 73 70 65 63 74 20 74 | 6f 20 74 68 65 20 6e 6f |espect t|o the no|
|00005ab0| 72 74 68 77 65 73 74 2e | 20 2a 2f 0a 0a 20 20 66 |rthwest.| */..  f|
|00005ac0| 64 5b 66 6d 69 64 5d 20 | 3d 20 78 6f 66 66 3b 0a |d[fmid] |= xoff;.|
|00005ad0| 20 20 62 64 5b 62 6d 69 | 64 5d 20 3d 20 78 6c 69 |  bd[bmi|d] = xli|
|00005ae0| 6d 3b 0a 0a 20 20 66 6f | 72 20 28 63 20 3d 20 31 |m;..  fo|r (c = 1|
|00005af0| 3b 3b 20 2b 2b 63 29 0a | 20 20 20 20 7b 0a 20 20 |;; ++c).|    {.  |
|00005b00| 20 20 20 20 69 6e 74 20 | 64 3b 09 09 09 2f 2a 20 |    int |d;.../* |
|00005b10| 41 63 74 69 76 65 20 64 | 69 61 67 6f 6e 61 6c 2e |Active d|iagonal.|
|00005b20| 20 2a 2f 0a 20 20 20 20 | 20 20 69 6e 74 20 62 69 | */.    |  int bi|
|00005b30| 67 5f 73 6e 61 6b 65 20 | 3d 20 30 3b 0a 0a 20 20 |g_snake |= 0;..  |
|00005b40| 20 20 20 20 2f 2a 20 45 | 78 74 65 6e 64 20 74 68 |    /* E|xtend th|
|00005b50| 65 20 74 6f 70 2d 64 6f | 77 6e 20 73 65 61 72 63 |e top-do|wn searc|
|00005b60| 68 20 62 79 20 61 6e 20 | 65 64 69 74 20 73 74 65 |h by an |edit ste|
|00005b70| 70 20 69 6e 20 65 61 63 | 68 20 64 69 61 67 6f 6e |p in eac|h diagon|
|00005b80| 61 6c 2e 20 2a 2f 0a 20 | 20 20 20 20 20 66 6d 69 |al. */. |     fmi|
|00005b90| 6e 20 3e 20 64 6d 69 6e | 20 3f 20 66 64 5b 2d 2d |n > dmin| ? fd[--|
|00005ba0| 66 6d 69 6e 20 2d 20 31 | 5d 20 3d 20 2d 31 20 3a |fmin - 1|] = -1 :|
|00005bb0| 20 2b 2b 66 6d 69 6e 3b | 0a 20 20 20 20 20 20 66 | ++fmin;|.      f|
|00005bc0| 6d 61 78 20 3c 20 64 6d | 61 78 20 3f 20 66 64 5b |max < dm|ax ? fd[|
|00005bd0| 2b 2b 66 6d 61 78 20 2b | 20 31 5d 20 3d 20 2d 31 |++fmax +| 1] = -1|
|00005be0| 20 3a 20 2d 2d 66 6d 61 | 78 3b 0a 20 20 20 20 20 | : --fma|x;.     |
|00005bf0| 20 66 6f 72 20 28 64 20 | 3d 20 66 6d 61 78 3b 20 | for (d |= fmax; |
|00005c00| 64 20 3e 3d 20 66 6d 69 | 6e 3b 20 64 20 2d 3d 20 |d >= fmi|n; d -= |
|00005c10| 32 29 0a 09 7b 0a 09 20 | 20 69 6e 74 20 78 2c 20 |2)..{.. | int x, |
|00005c20| 79 2c 20 6f 6c 64 78 2c | 20 74 6c 6f 20 3d 20 66 |y, oldx,| tlo = f|
|00005c30| 64 5b 64 20 2d 20 31 5d | 2c 20 74 68 69 20 3d 20 |d[d - 1]|, thi = |
|00005c40| 66 64 5b 64 20 2b 20 31 | 5d 3b 0a 0a 09 20 20 69 |fd[d + 1|];...  i|
|00005c50| 66 20 28 74 6c 6f 20 3e | 3d 20 74 68 69 29 0a 09 |f (tlo >|= thi)..|
|00005c60| 20 20 20 20 78 20 3d 20 | 74 6c 6f 20 2b 20 31 3b |    x = |tlo + 1;|
|00005c70| 0a 09 20 20 65 6c 73 65 | 0a 09 20 20 20 20 78 20 |..  else|..    x |
|00005c80| 3d 20 74 68 69 3b 0a 09 | 20 20 6f 6c 64 78 20 3d |= thi;..|  oldx =|
|00005c90| 20 78 3b 0a 09 20 20 79 | 20 3d 20 78 20 2d 20 64 | x;..  y| = x - d|
|00005ca0| 3b 0a 09 20 20 77 68 69 | 6c 65 20 28 78 20 3c 20 |;..  whi|le (x < |
|00005cb0| 78 6c 69 6d 20 26 26 20 | 79 20 3c 20 79 6c 69 6d |xlim && |y < ylim|
|00005cc0| 20 26 26 20 78 76 5b 78 | 5d 20 3d 3d 20 79 76 5b | && xv[x|] == yv[|
|00005cd0| 79 5d 29 0a 09 20 20 20 | 20 2b 2b 78 2c 20 2b 2b |y])..   | ++x, ++|
|00005ce0| 79 3b 0a 09 20 20 69 66 | 20 28 78 20 2d 20 6f 6c |y;..  if| (x - ol|
|00005cf0| 64 78 20 3e 20 32 30 29 | 0a 09 20 20 20 20 62 69 |dx > 20)|..    bi|
|00005d00| 67 5f 73 6e 61 6b 65 20 | 3d 20 31 3b 0a 09 20 20 |g_snake |= 1;..  |
|00005d10| 66 64 5b 64 5d 20 3d 20 | 78 3b 0a 09 20 20 69 66 |fd[d] = |x;..  if|
|00005d20| 20 28 6f 64 64 20 26 26 | 20 62 6d 69 6e 20 3c 3d | (odd &&| bmin <=|
|00005d30| 20 64 20 26 26 20 64 20 | 3c 3d 20 62 6d 61 78 20 | d && d |<= bmax |
|00005d40| 26 26 20 62 64 5b 64 5d | 20 3c 3d 20 66 64 5b 64 |&& bd[d]| <= fd[d|
|00005d50| 5d 29 0a 09 20 20 20 20 | 7b 0a 09 20 20 20 20 20 |])..    |{..     |
|00005d60| 20 2a 63 6f 73 74 20 3d | 20 32 20 2a 20 63 20 2d | *cost =| 2 * c -|
|00005d70| 20 31 3b 0a 09 20 20 20 | 20 20 20 72 65 74 75 72 | 1;..   |   retur|
|00005d80| 6e 20 64 3b 0a 09 20 20 | 20 20 7d 0a 09 7d 0a 0a |n d;..  |  }..}..|
|00005d90| 20 20 20 20 20 20 2f 2a | 20 53 69 6d 69 6c 61 72 |      /*| Similar|
|00005da0| 20 65 78 74 65 6e 64 20 | 74 68 65 20 62 6f 74 74 | extend |the bott|
|00005db0| 6f 6d 2d 75 70 20 73 65 | 61 72 63 68 2e 20 2a 2f |om-up se|arch. */|
|00005dc0| 0a 20 20 20 20 20 20 62 | 6d 69 6e 20 3e 20 64 6d |.      b|min > dm|
|00005dd0| 69 6e 20 3f 20 62 64 5b | 2d 2d 62 6d 69 6e 20 2d |in ? bd[|--bmin -|
|00005de0| 20 31 5d 20 3d 20 49 4e | 54 5f 4d 41 58 20 3a 20 | 1] = IN|T_MAX : |
|00005df0| 2b 2b 62 6d 69 6e 3b 0a | 20 20 20 20 20 20 62 6d |++bmin;.|      bm|
|00005e00| 61 78 20 3c 20 64 6d 61 | 78 20 3f 20 62 64 5b 2b |ax < dma|x ? bd[+|
|00005e10| 2b 62 6d 61 78 20 2b 20 | 31 5d 20 3d 20 49 4e 54 |+bmax + |1] = INT|
|00005e20| 5f 4d 41 58 20 3a 20 2d | 2d 62 6d 61 78 3b 0a 20 |_MAX : -|-bmax;. |
|00005e30| 20 20 20 20 20 66 6f 72 | 20 28 64 20 3d 20 62 6d |     for| (d = bm|
|00005e40| 61 78 3b 20 64 20 3e 3d | 20 62 6d 69 6e 3b 20 64 |ax; d >=| bmin; d|
|00005e50| 20 2d 3d 20 32 29 0a 09 | 7b 0a 09 20 20 69 6e 74 | -= 2)..|{..  int|
|00005e60| 20 78 2c 20 79 2c 20 6f | 6c 64 78 2c 20 74 6c 6f | x, y, o|ldx, tlo|
|00005e70| 20 3d 20 62 64 5b 64 20 | 2d 20 31 5d 2c 20 74 68 | = bd[d |- 1], th|
|00005e80| 69 20 3d 20 62 64 5b 64 | 20 2b 20 31 5d 3b 0a 0a |i = bd[d| + 1];..|
|00005e90| 09 20 20 69 66 20 28 74 | 6c 6f 20 3c 20 74 68 69 |.  if (t|lo < thi|
|00005ea0| 29 0a 09 20 20 20 20 78 | 20 3d 20 74 6c 6f 3b 0a |)..    x| = tlo;.|
|00005eb0| 09 20 20 65 6c 73 65 0a | 09 20 20 20 20 78 20 3d |.  else.|.    x =|
|00005ec0| 20 74 68 69 20 2d 20 31 | 3b 0a 09 20 20 6f 6c 64 | thi - 1|;..  old|
|00005ed0| 78 20 3d 20 78 3b 0a 09 | 20 20 79 20 3d 20 78 20 |x = x;..|  y = x |
|00005ee0| 2d 20 64 3b 0a 09 20 20 | 77 68 69 6c 65 20 28 78 |- d;..  |while (x|
|00005ef0| 20 3e 20 78 6f 66 66 20 | 26 26 20 79 20 3e 20 79 | > xoff |&& y > y|
|00005f00| 6f 66 66 20 26 26 20 78 | 76 5b 78 20 2d 20 31 5d |off && x|v[x - 1]|
|00005f10| 20 3d 3d 20 79 76 5b 79 | 20 2d 20 31 5d 29 0a 09 | == yv[y| - 1])..|
|00005f20| 20 20 20 20 2d 2d 78 2c | 20 2d 2d 79 3b 0a 09 20 |    --x,| --y;.. |
|00005f30| 20 69 66 20 28 6f 6c 64 | 78 20 2d 20 78 20 3e 20 | if (old|x - x > |
|00005f40| 32 30 29 0a 09 20 20 20 | 20 62 69 67 5f 73 6e 61 |20)..   | big_sna|
|00005f50| 6b 65 20 3d 20 31 3b 0a | 09 20 20 62 64 5b 64 5d |ke = 1;.|.  bd[d]|
|00005f60| 20 3d 20 78 3b 0a 09 20 | 20 69 66 20 28 21 6f 64 | = x;.. | if (!od|
|00005f70| 64 20 26 26 20 66 6d 69 | 6e 20 3c 3d 20 64 20 26 |d && fmi|n <= d &|
|00005f80| 26 20 64 20 3c 3d 20 66 | 6d 61 78 20 26 26 20 62 |& d <= f|max && b|
|00005f90| 64 5b 64 5d 20 3c 3d 20 | 66 64 5b 64 5d 29 0a 09 |d[d] <= |fd[d])..|
|00005fa0| 20 20 20 20 7b 0a 09 20 | 20 20 20 20 20 2a 63 6f |    {.. |     *co|
|00005fb0| 73 74 20 3d 20 32 20 2a | 20 63 3b 0a 09 20 20 20 |st = 2 *| c;..   |
|00005fc0| 20 20 20 72 65 74 75 72 | 6e 20 64 3b 0a 09 20 20 |   retur|n d;..  |
|00005fd0| 20 20 7d 0a 09 7d 0a 0a | 20 20 20 20 20 20 2f 2a |  }..}..|      /*|
|00005fe0| 20 48 65 75 72 69 73 74 | 69 63 3a 20 63 68 65 63 | Heurist|ic: chec|
|00005ff0| 6b 20 6f 63 63 61 73 69 | 6f 6e 61 6c 6c 79 20 66 |k occasi|onally f|
|00006000| 6f 72 20 61 20 64 69 61 | 67 6f 6e 61 6c 20 74 68 |or a dia|gonal th|
|00006010| 61 74 20 68 61 73 20 6d | 61 64 65 0a 09 20 6c 6f |at has m|ade.. lo|
|00006020| 74 73 20 6f 66 20 70 72 | 6f 67 72 65 73 73 20 63 |ts of pr|ogress c|
|00006030| 6f 6d 70 61 72 65 64 20 | 77 69 74 68 20 74 68 65 |ompared |with the|
|00006040| 20 65 64 69 74 20 64 69 | 73 74 61 6e 63 65 2e 0a | edit di|stance..|
|00006050| 09 20 49 66 20 77 65 20 | 68 61 76 65 20 61 6e 79 |. If we |have any|
|00006060| 20 73 75 63 68 2c 20 66 | 69 6e 64 20 74 68 65 20 | such, f|ind the |
|00006070| 6f 6e 65 20 74 68 61 74 | 20 68 61 73 20 6d 61 64 |one that| has mad|
|00006080| 65 20 74 68 65 20 6d 6f | 73 74 0a 09 20 70 72 6f |e the mo|st.. pro|
|00006090| 67 72 65 73 73 20 61 6e | 64 20 72 65 74 75 72 6e |gress an|d return|
|000060a0| 20 69 74 20 61 73 20 69 | 66 20 69 74 20 68 61 64 | it as i|f it had|
|000060b0| 20 73 75 63 63 65 65 64 | 65 64 2e 0a 0a 09 20 57 | succeed|ed.... W|
|000060c0| 69 74 68 20 74 68 69 73 | 20 68 65 75 72 69 73 74 |ith this| heurist|
|000060d0| 69 63 2c 20 66 6f 72 20 | 66 69 6c 65 73 20 77 69 |ic, for |files wi|
|000060e0| 74 68 20 61 20 63 6f 6e | 73 74 61 6e 74 20 73 6d |th a con|stant sm|
|000060f0| 61 6c 6c 20 64 65 6e 73 | 69 74 79 0a 09 20 6f 66 |all dens|ity.. of|
|00006100| 20 63 68 61 6e 67 65 73 | 2c 20 74 68 65 20 61 6c | changes|, the al|
|00006110| 67 6f 72 69 74 68 6d 20 | 69 73 20 6c 69 6e 65 61 |gorithm |is linea|
|00006120| 72 20 69 6e 20 74 68 65 | 20 66 69 6c 65 20 73 69 |r in the| file si|
|00006130| 7a 65 2e 20 20 2a 2f 0a | 0a 20 20 20 20 20 20 69 |ze.  */.|.      i|
|00006140| 66 20 28 63 20 3e 20 32 | 30 30 20 26 26 20 62 69 |f (c > 2|00 && bi|
|00006150| 67 5f 73 6e 61 6b 65 20 | 26 26 20 68 65 75 72 69 |g_snake |&& heuri|
|00006160| 73 74 69 63 29 0a 09 7b | 0a 09 20 20 69 6e 74 20 |stic)..{|..  int |
|00006170| 62 65 73 74 3b 0a 09 20 | 20 69 6e 74 20 62 65 73 |best;.. | int bes|
|00006180| 74 70 6f 73 3b 0a 0a 09 | 20 20 62 65 73 74 20 3d |tpos;...|  best =|
|00006190| 20 30 3b 0a 09 20 20 66 | 6f 72 20 28 64 20 3d 20 | 0;..  f|or (d = |
|000061a0| 66 6d 61 78 3b 20 64 20 | 3e 3d 20 66 6d 69 6e 3b |fmax; d |>= fmin;|
|000061b0| 20 64 20 2d 3d 20 32 29 | 0a 09 20 20 20 20 7b 0a | d -= 2)|..    {.|
|000061c0| 09 20 20 20 20 20 20 69 | 6e 74 20 64 64 20 3d 20 |.      i|nt dd = |
|000061d0| 64 20 2d 20 66 6d 69 64 | 3b 0a 09 20 20 20 20 20 |d - fmid|;..     |
|000061e0| 20 69 66 20 28 28 66 64 | 5b 64 5d 20 2d 20 78 6f | if ((fd|[d] - xo|
|000061f0| 66 66 29 2a 32 20 2d 20 | 64 64 20 3e 20 31 32 20 |ff)*2 - |dd > 12 |
|00006200| 2a 20 28 63 20 2b 20 28 | 64 64 20 3e 20 30 20 3f |* (c + (|dd > 0 ?|
|00006210| 20 64 64 20 3a 20 2d 64 | 64 29 29 29 0a 09 09 7b | dd : -d|d)))...{|
|00006220| 0a 09 09 20 20 69 66 20 | 28 66 64 5b 64 5d 20 2a |...  if |(fd[d] *|
|00006230| 20 32 20 2d 20 64 64 20 | 3e 20 62 65 73 74 0a 09 | 2 - dd |> best..|
|00006240| 09 20 20 20 20 20 20 26 | 26 20 66 64 5b 64 5d 20 |.      &|& fd[d] |
|00006250| 2d 20 78 6f 66 66 20 3e | 20 32 30 0a 09 09 20 20 |- xoff >| 20...  |
|00006260| 20 20 20 20 26 26 20 66 | 64 5b 64 5d 20 2d 20 64 |    && f|d[d] - d|
|00006270| 20 2d 20 79 6f 66 66 20 | 3e 20 32 30 29 0a 09 09 | - yoff |> 20)...|
|00006280| 20 20 20 20 7b 0a 09 09 | 20 20 20 20 20 20 69 6e |    {...|      in|
|00006290| 74 20 6b 3b 0a 09 09 20 | 20 20 20 20 20 69 6e 74 |t k;... |     int|
|000062a0| 20 78 20 3d 20 66 64 5b | 64 5d 3b 0a 0a 09 09 20 | x = fd[|d];.... |
|000062b0| 20 20 20 20 20 2f 2a 20 | 57 65 20 68 61 76 65 20 |     /* |We have |
|000062c0| 61 20 67 6f 6f 64 20 65 | 6e 6f 75 67 68 20 62 65 |a good e|nough be|
|000062d0| 73 74 20 64 69 61 67 6f | 6e 61 6c 3b 0a 09 09 09 |st diago|nal;....|
|000062e0| 20 6e 6f 77 20 69 6e 73 | 69 73 74 20 74 68 61 74 | now ins|ist that|
|000062f0| 20 69 74 20 65 6e 64 20 | 77 69 74 68 20 61 20 73 | it end |with a s|
|00006300| 69 67 6e 69 66 69 63 61 | 6e 74 20 73 6e 61 6b 65 |ignifica|nt snake|
|00006310| 2e 20 20 2a 2f 0a 09 09 | 20 20 20 20 20 20 66 6f |.  */...|      fo|
|00006320| 72 20 28 6b 20 3d 20 31 | 3b 20 6b 20 3c 3d 20 32 |r (k = 1|; k <= 2|
|00006330| 30 3b 20 6b 2b 2b 29 0a | 09 09 09 69 66 20 28 78 |0; k++).|...if (x|
|00006340| 76 65 63 5b 78 20 2d 20 | 6b 5d 20 21 3d 20 79 76 |vec[x - |k] != yv|
|00006350| 65 63 5b 78 20 2d 20 64 | 20 2d 20 6b 5d 29 0a 09 |ec[x - d| - k])..|
|00006360| 09 09 20 20 62 72 65 61 | 6b 3b 0a 0a 09 09 20 20 |..  brea|k;....  |
|00006370| 20 20 20 20 69 66 20 28 | 6b 20 3d 3d 20 32 31 29 |    if (|k == 21)|
|00006380| 0a 09 09 09 7b 0a 09 09 | 09 20 20 62 65 73 74 20 |....{...|.  best |
|00006390| 3d 20 66 64 5b 64 5d 20 | 2a 20 32 20 2d 20 64 64 |= fd[d] |* 2 - dd|
|000063a0| 3b 0a 09 09 09 20 20 62 | 65 73 74 70 6f 73 20 3d |;....  b|estpos =|
|000063b0| 20 64 3b 0a 09 09 09 7d | 0a 09 09 20 20 20 20 7d | d;....}|...    }|
|000063c0| 0a 09 09 7d 0a 09 20 20 | 20 20 7d 0a 09 20 20 69 |...}..  |  }..  i|
|000063d0| 66 20 28 62 65 73 74 20 | 3e 20 30 29 0a 09 20 20 |f (best |> 0)..  |
|000063e0| 20 20 7b 0a 09 20 20 20 | 20 20 20 2a 63 6f 73 74 |  {..   |   *cost|
|000063f0| 20 3d 20 32 20 2a 20 63 | 20 2d 20 31 3b 0a 09 20 | = 2 * c| - 1;.. |
+--------+-------------------------+-------------------------+--------+--------+