Done day 5.

4 files changed, 704 insertions, 0 deletions

diff --git a/5.c b/5.c
new file mode 100644
index 0000000..9ba87a5
--- /dev/null
+++ b/5.c
@@ -0,0 +1,87 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_BOARDS 100
+
+static char *ReadLine(char *p, size_t size, FILE *fp)
+{
+    if ((p=fgets(p, size, fp)))
+    {
+        size_t l = strlen(p);
+
+        while(l && p[l-1] == '\n')
+        {
+            p[--l] = 0;
+        }
+    }
+
+    return p;
+}
+
+static int Max(int a, int b)
+{
+    return a > b ? a : b;
+}
+
+static int Min(int a, int b)
+{
+    return a < b ? a : b;
+}
+
+int main(void)
+{
+    char buff[1024];
+    int board[1000][1000] = {0};
+    char *p = NULL;
+    int f = 0;
+    int x1 = 0;
+    int y1 = 0;
+    int x2 = 0;
+    int y2 = 0;
+    int x = 0;
+    int y = 0;
+    int sum = 0;
+
+    while (ReadLine(buff, sizeof buff, stdin))
+    {
+        p = strtok(buff, " ,->");
+        x1 = atoi(p);
+        p = strtok(NULL, " ,->");
+        y1 = atoi(p);
+        p = strtok(NULL, " ,->");
+        x2 = atoi(p);
+        p = strtok(NULL, " ,->");
+        y2 = atoi(p);
+
+        if (x1 == x2)
+        {
+            for(y = Min(y1, y2); y <= Max(y1, y2); y++)
+            {
+                board[y][x1]++;
+            }
+        }
+        else if (y1 == y2)
+        {
+            for(x = Min(x1, x2); x <= Max(x1, x2); x++)
+            {
+                board[y1][x]++;
+            }
+        }
+    }
+
+    for(y = 0; y < 999; y++)
+    {
+        for(x = 0; x < 999; x++)
+        {
+            if (board[y][x] > 1)
+            {
+                sum++;
+            }
+        }
+    }
+
+    printf("sum = %d\n", sum);
+
+    return 0;
+}
diff --git a/5a.c b/5a.c
new file mode 100644
index 0000000..2776906
--- /dev/null
+++ b/5a.c
@@ -0,0 +1,107 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_BOARDS 100
+
+static char *ReadLine(char *p, size_t size, FILE *fp)
+{
+    if ((p=fgets(p, size, fp)))
+    {
+        size_t l = strlen(p);
+
+        while(l && p[l-1] == '\n')
+        {
+            p[--l] = 0;
+        }
+    }
+
+    return p;
+}
+
+static int Max(int a, int b)
+{
+    return a > b ? a : b;
+}
+
+static int Min(int a, int b)
+{
+    return a < b ? a : b;
+}
+
+int main(void)
+{
+    char buff[1024];
+    int board[1000][1000] = {0};
+    char *p = NULL;
+    int f = 0;
+    int x1 = 0;
+    int y1 = 0;
+    int x2 = 0;
+    int y2 = 0;
+    int x = 0;
+    int y = 0;
+    int sum = 0;
+
+    while (ReadLine(buff, sizeof buff, stdin))
+    {
+        p = strtok(buff, " ,->");
+        x1 = atoi(p);
+        p = strtok(NULL, " ,->");
+        y1 = atoi(p);
+        p = strtok(NULL, " ,->");
+        x2 = atoi(p);
+        p = strtok(NULL, " ,->");
+        y2 = atoi(p);
+
+        if (x1 == x2)
+        {
+            for(y = Min(y1, y2); y <= Max(y1, y2); y++)
+            {
+                board[y][x1]++;
+            }
+        }
+        else if (y1 == y2)
+        {
+            for(x = Min(x1, x2); x <= Max(x1, x2); x++)
+            {
+                board[y1][x]++;
+            }
+        }
+        else
+        {
+            int dx;
+            int dy;
+
+            dx = x1 < x2 ? 1 : -1;
+            dy = y1 < y2 ? 1 : -1;
+
+            x = x1;
+            y = y1;
+
+            while(x != x2 && y != y2)
+            {
+                board[y][x]++;
+                x += dx;
+                y += dy;
+            }
+
+            board[y][x]++;
+        }
+    }
+
+    for(y = 0; y < 999; y++)
+    {
+        for(x = 0; x < 999; x++)
+        {
+            if (board[y][x] > 1)
+            {
+                sum++;
+            }
+        }
+    }
+
+    printf("sum = %d\n", sum);
+
+    return 0;
+}
diff --git a/data.5 b/data.5
new file mode 100644
index 0000000..04fa5cb
--- /dev/null
+++ b/data.5
@@ -0,0 +1,500 @@
+657,934 -> 657,926
+130,34 -> 570,474
+478,716 -> 226,464
+861,110 -> 861,167
+448,831 -> 370,831
+75,738 -> 390,738
+26,880 -> 864,42
+965,658 -> 527,220
+208,381 -> 80,381
+523,475 -> 807,475
+219,69 -> 219,434
+793,538 -> 534,797
+754,602 -> 754,148
+443,327 -> 443,611
+606,395 -> 546,395
+980,56 -> 51,985
+619,325 -> 354,325
+342,123 -> 819,600
+290,533 -> 374,533
+598,77 -> 598,75
+605,302 -> 605,636
+97,981 -> 692,386
+278,779 -> 278,800
+661,377 -> 661,10
+726,108 -> 518,316
+271,883 -> 271,50
+382,271 -> 606,271
+963,358 -> 891,286
+496,880 -> 496,855
+211,142 -> 211,49
+841,866 -> 260,285
+841,849 -> 173,181
+927,326 -> 391,862
+396,558 -> 459,558
+753,183 -> 953,183
+941,698 -> 941,407
+347,612 -> 347,476
+18,340 -> 18,612
+140,299 -> 797,956
+714,907 -> 714,228
+966,155 -> 194,927
+769,674 -> 712,674
+644,675 -> 948,979
+703,872 -> 812,763
+26,629 -> 120,535
+844,738 -> 844,253
+798,133 -> 798,795
+27,318 -> 288,57
+38,545 -> 872,545
+827,351 -> 195,983
+818,45 -> 21,842
+257,559 -> 626,928
+145,925 -> 886,184
+83,618 -> 590,111
+326,243 -> 53,243
+489,278 -> 526,278
+783,693 -> 783,525
+495,636 -> 495,585
+374,716 -> 215,557
+839,536 -> 839,966
+850,468 -> 955,468
+55,799 -> 55,447
+472,722 -> 296,898
+390,731 -> 120,461
+405,493 -> 208,296
+807,42 -> 56,793
+476,327 -> 655,327
+24,965 -> 967,22
+776,211 -> 776,850
+489,20 -> 822,20
+630,740 -> 871,499
+743,493 -> 283,953
+62,429 -> 62,720
+806,270 -> 806,332
+550,154 -> 107,597
+71,713 -> 533,251
+620,575 -> 620,156
+726,829 -> 143,246
+944,553 -> 468,553
+185,582 -> 185,468
+845,266 -> 212,899
+654,97 -> 265,486
+726,609 -> 726,147
+631,76 -> 860,76
+835,24 -> 928,24
+712,719 -> 74,81
+616,478 -> 616,117
+903,226 -> 903,577
+440,699 -> 136,395
+215,705 -> 890,30
+20,24 -> 981,985
+102,144 -> 850,892
+695,967 -> 582,967
+219,284 -> 219,388
+359,833 -> 665,833
+389,55 -> 305,55
+59,32 -> 957,930
+815,198 -> 64,949
+699,540 -> 717,558
+215,682 -> 182,682
+805,489 -> 328,489
+43,546 -> 578,546
+489,181 -> 489,363
+266,391 -> 266,582
+863,368 -> 448,368
+83,236 -> 83,487
+874,875 -> 874,413
+799,90 -> 799,802
+253,29 -> 253,905
+136,446 -> 435,745
+830,534 -> 550,534
+183,785 -> 107,785
+81,517 -> 159,517
+359,941 -> 359,560
+71,546 -> 948,546
+596,811 -> 596,791
+255,960 -> 255,159
+788,15 -> 788,682
+240,55 -> 240,244
+51,423 -> 137,423
+504,418 -> 809,723
+131,842 -> 914,59
+727,790 -> 82,145
+281,509 -> 841,509
+797,807 -> 834,807
+333,499 -> 790,499
+215,328 -> 215,139
+500,898 -> 500,862
+75,217 -> 777,919
+17,264 -> 17,446
+852,755 -> 150,755
+865,186 -> 385,186
+158,192 -> 158,733
+196,261 -> 196,128
+989,960 -> 131,102
+807,393 -> 807,153
+507,579 -> 507,764
+468,76 -> 535,76
+381,357 -> 659,357
+794,277 -> 749,277
+51,152 -> 546,647
+797,959 -> 458,959
+82,156 -> 967,156
+261,624 -> 460,624
+597,53 -> 197,53
+153,507 -> 411,765
+305,717 -> 768,717
+344,954 -> 344,217
+194,432 -> 545,432
+346,46 -> 557,46
+685,599 -> 685,312
+49,719 -> 49,631
+499,668 -> 304,863
+262,405 -> 554,405
+87,64 -> 295,64
+859,675 -> 74,675
+663,776 -> 99,212
+232,189 -> 232,904
+777,276 -> 703,276
+704,492 -> 86,492
+142,736 -> 514,364
+418,611 -> 224,417
+602,571 -> 602,424
+152,603 -> 248,603
+915,673 -> 143,673
+538,32 -> 128,32
+975,885 -> 975,344
+870,511 -> 870,756
+330,798 -> 46,798
+440,195 -> 587,195
+739,237 -> 568,66
+54,838 -> 196,980
+370,556 -> 47,556
+124,575 -> 748,575
+261,283 -> 880,902
+784,91 -> 426,449
+764,670 -> 148,670
+32,51 -> 967,986
+807,906 -> 10,906
+470,488 -> 579,597
+274,649 -> 285,649
+221,540 -> 221,94
+914,957 -> 914,510
+879,825 -> 145,91
+438,833 -> 438,775
+191,844 -> 911,124
+145,763 -> 595,763
+504,81 -> 622,199
+834,206 -> 834,704
+908,308 -> 815,308
+929,567 -> 929,322
+805,50 -> 620,235
+36,409 -> 133,312
+345,375 -> 19,701
+468,948 -> 468,108
+109,547 -> 446,547
+929,916 -> 69,56
+927,857 -> 318,248
+833,948 -> 833,61
+559,787 -> 559,982
+293,825 -> 293,775
+508,744 -> 545,744
+827,713 -> 753,639
+88,775 -> 555,775
+523,812 -> 684,812
+307,142 -> 307,265
+636,40 -> 355,321
+891,875 -> 891,25
+301,423 -> 712,12
+922,187 -> 219,890
+45,447 -> 230,262
+114,568 -> 233,687
+573,398 -> 677,398
+334,101 -> 324,101
+957,277 -> 957,652
+943,834 -> 610,834
+523,632 -> 523,379
+958,361 -> 90,361
+408,824 -> 380,824
+647,314 -> 647,449
+747,83 -> 59,83
+776,104 -> 937,104
+16,984 -> 989,11
+362,581 -> 362,226
+72,962 -> 940,94
+319,877 -> 319,122
+310,206 -> 986,882
+794,877 -> 267,877
+855,58 -> 976,58
+699,971 -> 598,971
+162,556 -> 162,440
+494,859 -> 494,255
+794,210 -> 142,862
+275,510 -> 548,510
+739,592 -> 739,793
+376,985 -> 376,990
+755,264 -> 280,739
+187,34 -> 187,688
+770,827 -> 770,548
+10,68 -> 913,971
+571,427 -> 571,944
+153,211 -> 153,560
+976,972 -> 55,51
+103,611 -> 674,40
+95,972 -> 924,143
+929,94 -> 38,985
+777,330 -> 60,330
+312,430 -> 312,326
+549,433 -> 269,433
+477,267 -> 477,403
+598,375 -> 19,375
+512,799 -> 512,831
+348,700 -> 348,43
+165,97 -> 63,199
+38,835 -> 38,828
+282,334 -> 282,909
+14,891 -> 390,515
+930,657 -> 334,61
+630,341 -> 630,85
+671,464 -> 319,112
+949,340 -> 894,285
+663,916 -> 245,916
+114,395 -> 286,223
+335,804 -> 529,804
+567,338 -> 14,891
+623,705 -> 379,949
+82,864 -> 545,401
+932,128 -> 932,134
+291,294 -> 291,101
+739,765 -> 739,757
+460,94 -> 892,94
+375,673 -> 367,681
+81,831 -> 90,831
+890,402 -> 890,138
+775,547 -> 790,547
+49,927 -> 966,10
+23,116 -> 257,116
+923,75 -> 18,980
+63,986 -> 687,362
+369,844 -> 357,844
+790,188 -> 644,188
+557,282 -> 557,669
+861,173 -> 390,644
+480,529 -> 893,529
+32,960 -> 830,162
+368,725 -> 368,40
+502,600 -> 701,600
+63,977 -> 873,167
+463,518 -> 788,193
+738,406 -> 324,406
+162,931 -> 822,931
+377,487 -> 707,817
+610,319 -> 901,319
+586,658 -> 690,658
+25,288 -> 53,288
+760,602 -> 760,628
+294,62 -> 951,62
+222,773 -> 661,334
+151,483 -> 646,483
+272,852 -> 317,852
+557,906 -> 503,960
+736,445 -> 736,703
+241,376 -> 241,692
+835,41 -> 835,369
+987,743 -> 987,210
+42,700 -> 42,244
+646,136 -> 646,440
+544,751 -> 404,751
+295,651 -> 295,805
+687,878 -> 113,878
+290,142 -> 604,142
+579,920 -> 579,807
+12,985 -> 987,10
+919,940 -> 919,808
+770,143 -> 770,832
+114,76 -> 962,76
+876,882 -> 428,434
+861,139 -> 861,320
+888,59 -> 888,39
+629,823 -> 707,823
+296,598 -> 296,305
+61,54 -> 578,54
+864,58 -> 253,58
+71,861 -> 306,861
+682,181 -> 326,537
+307,418 -> 307,910
+810,251 -> 810,431
+151,836 -> 602,385
+954,987 -> 243,276
+724,272 -> 350,646
+134,295 -> 434,295
+178,235 -> 802,859
+832,688 -> 832,573
+165,334 -> 165,378
+816,26 -> 114,728
+668,192 -> 540,192
+730,341 -> 969,341
+951,169 -> 286,834
+647,115 -> 886,115
+664,288 -> 507,131
+609,362 -> 609,295
+747,479 -> 287,19
+350,967 -> 350,725
+117,383 -> 311,383
+871,124 -> 292,124
+654,271 -> 547,271
+525,773 -> 345,953
+401,670 -> 610,670
+930,196 -> 301,825
+336,37 -> 961,662
+714,212 -> 714,667
+454,848 -> 454,107
+587,390 -> 587,577
+530,437 -> 542,437
+304,229 -> 517,229
+340,571 -> 766,571
+727,941 -> 138,352
+831,325 -> 11,325
+241,294 -> 403,456
+788,658 -> 788,126
+337,360 -> 337,589
+799,402 -> 342,402
+530,820 -> 530,319
+982,27 -> 20,989
+923,936 -> 923,721
+581,395 -> 64,912
+61,509 -> 61,827
+989,580 -> 610,580
+477,592 -> 219,592
+296,775 -> 296,58
+204,12 -> 204,457
+190,171 -> 190,673
+939,200 -> 939,457
+472,282 -> 472,631
+983,331 -> 734,331
+365,609 -> 365,817
+640,698 -> 145,698
+103,618 -> 549,618
+454,319 -> 454,346
+650,815 -> 381,546
+624,603 -> 507,603
+966,445 -> 723,445
+763,129 -> 763,784
+695,145 -> 695,511
+498,84 -> 435,147
+188,716 -> 967,716
+810,446 -> 810,924
+731,483 -> 731,51
+307,783 -> 307,533
+15,956 -> 956,15
+192,210 -> 882,210
+303,173 -> 38,438
+769,952 -> 769,863
+135,781 -> 405,781
+494,436 -> 494,892
+705,394 -> 714,394
+164,37 -> 164,633
+813,232 -> 813,620
+227,906 -> 222,906
+542,432 -> 414,432
+549,858 -> 88,397
+200,101 -> 958,859
+235,565 -> 469,331
+492,871 -> 503,882
+704,398 -> 869,563
+450,736 -> 746,736
+420,706 -> 420,635
+717,493 -> 686,524
+187,554 -> 717,24
+31,851 -> 315,851
+800,230 -> 466,230
+226,324 -> 226,614
+937,927 -> 937,798
+143,26 -> 534,417
+952,344 -> 12,344
+181,361 -> 782,361
+925,906 -> 415,396
+685,944 -> 470,944
+200,627 -> 290,627
+728,285 -> 728,326
+271,864 -> 271,34
+802,558 -> 207,558
+963,26 -> 84,905
+504,60 -> 529,60
+840,292 -> 180,292
+914,272 -> 914,330
+82,107 -> 925,950
+33,245 -> 33,134
+463,663 -> 463,82
+27,305 -> 27,675
+276,894 -> 891,279
+746,325 -> 746,948
+249,657 -> 341,749
+530,848 -> 28,346
+798,617 -> 798,609
+119,767 -> 312,767
+80,18 -> 674,18
+723,374 -> 583,374
+582,985 -> 239,642
+217,765 -> 217,395
+811,159 -> 609,159
+689,896 -> 501,896
+562,881 -> 562,96
+244,621 -> 629,621
+277,379 -> 277,287
+856,153 -> 20,153
+518,228 -> 518,898
+230,789 -> 243,789
+534,335 -> 534,592
+240,790 -> 413,617
+768,615 -> 768,560
+773,101 -> 912,101
+252,571 -> 767,56
+370,595 -> 681,906
+565,176 -> 565,318
+750,465 -> 750,724
+979,130 -> 120,989
+160,153 -> 160,785
+610,222 -> 610,191
+873,124 -> 130,867
+519,593 -> 519,32
+525,947 -> 525,562
+50,292 -> 291,533
+558,927 -> 960,525
+536,694 -> 249,981
+954,896 -> 277,896
+732,202 -> 732,288
+447,989 -> 541,895
+890,754 -> 367,231
+368,89 -> 564,285
+588,100 -> 588,156
+282,313 -> 943,974
+16,792 -> 495,792
+111,591 -> 111,493
+57,713 -> 685,85
+676,632 -> 676,575
+560,708 -> 560,602
+489,288 -> 489,404
+904,515 -> 443,54
+70,977 -> 985,62
+11,119 -> 11,403
+215,859 -> 937,137
+78,469 -> 110,437
+747,605 -> 747,369
+847,598 -> 847,299
+742,695 -> 159,112
+986,370 -> 986,460
+631,900 -> 771,760
+228,406 -> 683,861
+189,639 -> 61,639
+221,650 -> 820,650
+558,569 -> 834,845
+655,533 -> 558,630
+967,921 -> 967,169
+230,308 -> 429,308
+873,762 -> 873,528
+412,151 -> 412,538
+881,587 -> 881,21
+941,45 -> 26,960
+377,126 -> 700,126
diff --git a/data.5a b/data.5a
new file mode 100644
index 0000000..b258f68
--- /dev/null
+++ b/data.5a
@@ -0,0 +1,10 @@
+0,9 -> 5,9
+8,0 -> 0,8
+9,4 -> 3,4
+2,2 -> 2,1
+7,0 -> 7,4
+6,4 -> 2,0
+0,9 -> 2,9
+3,4 -> 1,4
+0,0 -> 8,8
+5,5 -> 8,2