这个挖坑项目，果然是有坑的。
/* ID: qq104801 LANG: C++ TASK: ditch */ #include <iostream> #include <fstream> #include <cstring> #include <vector> #include <queue> #include <stack> #include <algorithm> using namespace std; const int inf=0xfffffff; const int nmax=205; int n,m,ans; int a[nmax][nmax]; int next[nmax],d[nmax][nmax],p[nmax]; queue<int>q; void test() { freopen("ditch.in","r",stdin); freopen("ditch.out","w",stdout); //init readin and change cin>>n>>m; int k1,k2,k3; for(int i=1;i<=n;i++) { cin>>k1>>k2>>k3; a[k1][k2]+=k3; } while(true) { memset(p,0,sizeof(p)); p[1]=inf; q.push(1); while(!q.empty()) { int v=q.front();q.pop(); for(int i=1;i<=m;i++) if(!p[i] && a[v][i]>d[v][i]) { next[i]=v;q.push(i); p[i]=p[v]<a[v][i]-d[v][i]?p[v]:a[v][i]-d[v][i]; } } if(!p[m])break; for(int i=m;i!=1;i=next[i]) { d[next[i]][i]+=p[m]; d[i][next[i]]-=p[m]; } ans+=p[m]; } cout<<ans<<endl; } int main () { test(); return 0; }
test data
USACO Training Grader Results 8 users online CHN/5 IRN/1 POL/1 USA/1 USER: cn tom [qq104801] TASK: ditch LANG: C++ Compiling... Compile: OK Executing... Test 1: TEST OK [0.008 secs, 3836 KB] Test 2: TEST OK [0.005 secs, 3836 KB] Test 3: TEST OK [0.005 secs, 3836 KB] Test 4: TEST OK [0.008 secs, 3836 KB] Test 5: TEST OK [0.005 secs, 3836 KB] Test 6: TEST OK [0.008 secs, 3836 KB] Test 7: TEST OK [0.008 secs, 3836 KB] Test 8: TEST OK [0.016 secs, 3836 KB] Test 9: TEST OK [0.014 secs, 3836 KB] Test 10: TEST OK [0.005 secs, 3836 KB] Test 11: TEST OK [0.008 secs, 3836 KB] Test 12: TEST OK [0.011 secs, 3836 KB] All tests OK. YOUR PROGRAM ('ditch') WORKED FIRST TIME! That's fantastic -- and a rare thing. Please accept these special automated congratulations. Here are the test data inputs: ------- test 1 ---- 5 4 1 2 40 1 4 20 2 4 20 2 3 30 3 4 10 ------- test 2 ---- 3 3 1 2 5 2 2 100 2 3 3 ------- test 3 ---- 7 6 1 2 10000 2 3 10000 3 6 10000 1 4 8000 4 3 8000 2 5 6000 5 6 6000 ------- test 4 ---- 13 5 1 2 46 1 3 73 1 4 33 1 5 20 2 3 35 2 4 15 2 5 86 3 2 51 3 4 93 3 5 35 4 2 100 4 3 91 4 5 11 ------- test 5 ---- 22 11 1 6 5 1 7 3 1 3 5 6 3 2 3 7 2 6 4 3 6 5 2 3 5 5 3 9 2 7 9 3 9 5 1 5 4 1 4 10 5 5 10 2 5 2 3 5 8 2 9 8 3 10 2 2 2 8 2 10 11 5 2 11 4 8 11 4 ------- test 6 ---- 18 12 1 3 7 1 2 3 3 6 1 3 5 2 2 6 3 2 5 3 2 4 3 6 9 4 5 9 2 5 8 4 5 7 2 4 7 3 7 10 3 9 11 3 8 11 2 8 10 2 10 12 3 11 12 4 ------- test 7 ---- 150 50 1 20 10359 1 11 884156 11 4 382580 20 30 643764 4 35 108262 4 31 5964 30 45 39000 20 28 68490 45 34 210801 31 10 308295 20 6 138736 20 42 746938 34 16 852078 31 38 277748 6 46 18696 30 40 417582 34 7 88038 28 44 694544 11 29 317312 11 13 555839 6 17 1880 31 39 59624 42 41 79240 6 33 207975 20 18 262560 42 14 247718 16 36 121806 41 23 109872 33 48 124786 39 2 117008 20 49 382176 44 47 726 39 9 137648 23 21 277875 9 15 309902 30 8 54600 33 12 201208 33 32 907308 36 24 261030 46 27 117396 18 22 818460 38 19 567361 32 5 483645 1 26 319310 18 3 143376 33 25 335692 40 37 188258 31 43 483140 28 50 111967 35 48 372193 49 43 491200 5 31 248692 11 9 517439 5 25 13200 11 10 7429 13 43 475146 47 48 311865 18 29 203008 33 22 126540 35 38 110307 8 22 745056 28 42 575900 16 50 292864 32 17 476779 34 29 390260 42 16 347761 14 34 347529 49 21 238952 15 12 9882 39 20 577920 11 27 87432 42 29 389325 43 45 47878 40 30 74333 34 39 409684 37 1 708825 49 34 79216 23 23 120915 27 30 239169 7 18 13244 7 6 599664 45 23 34224 15 5 300748 36 33 494384 9 3 37356 13 43 184200 24 6 665000 42 7 60998 32 30 77787 43 31 5742 2 9 340830 40 6 34920 12 41 338588 43 10 387180 34 11 359251 17 48 498232 5 42 540925 20 24 148716 17 34 546150 42 41 410800 9 28 485475 3 33 225524 19 8 226634 47 30 163296 35 27 406686 13 4 271467 9 22 341388 36 41 379776 24 50 848350 30 6 386379 17 16 352521 7 23 568980 12 26 5124 13 4 151525 6 23 589620 19 43 55296 7 3 182932 15 4 104720 40 15 496027 15 30 25508 49 38 87330 10 42 377169 8 45 331850 37 16 359940 37 41 36768 2 36 400476 32 41 803964 47 35 149169 39 20 14520 47 19 26130 45 1 19840 42 13 225368 18 24 141696 31 44 140760 8 38 599196 28 9 237846 47 36 301325 21 18 27546 23 17 208110 34 17 263718 31 20 372164 49 2 498168 11 7 323912 34 2 102256 20 10 207165 25 3 71649 23 21 156112 16 48 840 33 8 101052 4 18 39879 ------- test 8 ---- 183 15 1 2 31 1 3 46 1 4 26 1 5 29 1 6 62 1 7 25 1 8 38 1 9 7 1 10 39 1 11 31 1 12 86 1 13 92 1 14 50 1 15 9 2 3 43 2 4 88 2 5 30 2 6 14 2 7 44 2 8 87 2 9 68 2 10 65 2 11 16 2 12 68 2 13 65 2 14 42 2 15 2 3 2 18 3 4 56 3 5 49 3 6 28 3 7 4 3 8 44 3 9 82 3 10 76 3 11 70 3 12 67 3 13 93 3 14 19 3 15 76 4 2 51 4 3 5 4 5 84 4 6 47 4 7 63 4 8 72 4 9 91 4 10 65 4 11 14 4 12 28 4 13 44 4 14 66 4 15 36 5 2 27 5 3 11 5 4 70 5 6 74 5 7 18 5 8 82 5 9 14 5 10 25 5 11 52 5 12 29 5 13 5 5 14 63 5 15 64 6 2 60 6 3 75 6 4 65 6 5 43 6 7 5 6 8 49 6 9 7 6 10 6 6 11 6 6 12 9 6 13 29 6 14 11 6 15 56 7 2 62 7 3 28 7 4 26 7 5 66 7 6 100 7 8 97 7 9 58 7 10 2 7 11 61 7 12 63 7 13 7 7 14 63 7 15 66 8 2 32 8 3 11 8 4 43 8 5 63 8 6 2 8 7 54 8 9 68 8 10 30 8 11 64 8 12 23 8 13 28 8 14 87 8 15 27 9 2 66 9 3 92 9 4 54 9 5 99 9 6 36 9 7 55 9 8 17 9 10 72 9 11 88 9 12 77 9 13 33 9 14 24 9 15 4 10 2 71 10 3 33 10 4 94 10 5 12 10 6 9 10 7 59 10 8 41 10 9 82 10 11 89 10 12 98 10 13 53 10 14 50 10 15 42 11 2 38 11 3 100 11 4 74 11 5 19 11 6 14 11 7 8 11 8 58 11 9 35 11 10 77 11 12 52 11 13 46 11 14 10 11 15 35 12 2 27 12 3 35 12 4 94 12 5 27 12 6 16 12 7 99 12 8 1 12 9 45 12 10 2 12 11 77 12 13 40 12 14 95 12 15 47 13 2 10 13 3 90 13 4 99 13 5 84 13 6 95 13 7 78 13 8 17 13 9 35 13 10 26 13 11 16 13 12 24 13 14 28 13 15 96 14 2 80 14 3 87 14 4 98 14 5 32 14 6 46 14 7 88 14 8 52 14 9 29 14 10 91 14 11 55 14 12 99 14 13 70 14 15 81 ------- test 9 ---- 199 200 1 77 604884 1 158 4482 77 160 333909 158 72 830172 160 64 111300 72 40 9396 77 10 65070 40 125 760487 77 20 223728 10 90 559854 160 82 23684 20 190 19951 40 89 230917 72 163 496531 163 81 273112 10 67 379392 82 79 355426 1 9 515788 64 55 338776 72 166 223710 79 189 42921 40 156 155709 64 104 431550 79 177 684777 67 129 55872 166 76 133734 81 186 503211 82 172 47040 76 145 37416 166 115 49680 129 137 551265 55 174 373672 67 7 208311 160 32 184600 1 194 5887 190 131 600576 174 86 45660 125 83 298622 115 3 208636 189 38 87165 64 134 13939 129 120 834561 9 114 873356 83 61 241411 125 21 9451 32 121 582826 114 42 41010 1 122 70522 10 193 102916 137 182 150228 64 123 422576 86 78 13800 89 58 32263 114 52 275138 182 144 304083 58 43 442677 166 93 839289 43 98 162000 61 154 95448 43 181 3796 189 16 315746 125 80 191333 89 139 326648 129 60 235800 61 45 127610 172 180 193669 156 70 131008 104 185 304358 61 6 138124 79 34 653103 20 183 153560 158 48 125775 80 184 684530 166 41 150800 48 5 504546 145 35 55991 21 8 44550 160 178 88008 83 192 197750 98 171 419856 61 74 498050 174 124 91800 77 109 142443 82 71 147887 98 36 14155 58 151 32431 9 69 458736 193 11 676788 124 31 228613 185 191 250010 185 14 374026 81 23 713800 8 91 46172 109 197 231114 98 73 726792 194 62 130084 129 138 4062 131 13 274850 69 15 24108 61 155 15925 192 111 558742 61 29 232392 158 118 210896 73 28 170820 111 135 229704 137 132 149916 194 126 270359 123 37 17604 138 168 265972 137 88 200238 132 2 146544 82 187 75690 172 27 575296 21 65 808704 82 63 154890 137 101 241569 14 102 180495 109 22 670140 191 44 129628 38 107 426420 28 39 114042 40 164 951500 180 153 641904 20 49 133951 49 173 238822 109 148 22480 98 50 567248 44 105 245900 93 133 129984 36 116 129008 178 54 30753 183 188 29890 194 167 453888 135 18 314336 144 108 351348 35 141 72864 10 66 106416 16 51 116171 125 157 53204 178 92 85519 16 53 260766 2 195 372122 92 19 434115 197 196 152163 69 30 179488 174 25 797568 7 103 168795 2 176 403032 49 17 304668 93 12 170819 3 198 511236 98 146 290598 31 179 788832 40 117 291067 38 100 407355 23 96 467181 183 46 442224 144 161 6756 13 136 13240 171 127 278240 30 47 92040 137 33 327921 132 95 228704 93 175 28580 14 113 289170 154 4 749112 62 152 827836 146 57 57376 19 87 15072 179 24 26052 126 143 135582 154 128 109368 66 75 261838 91 110 97314 103 68 16560 15 170 52828 170 84 19250 125 159 33300 129 199 481887 4 112 152482 14 130 216112 185 59 603099 127 162 384888 44 85 264600 137 99 160038 55 169 58720 36 147 141354 163 26 327262 5 142 185472 129 150 247764 105 106 25193 158 119 98928 130 94 360690 33 149 434420 31 165 571980 65 140 175080 163 56 901033 8 97 35 158 200 633027 ------- test 10 ---- 199 50 1 46 250104 1 24 899262 1 15 80055 1 37 50603 1 49 37800 37 38 320870 37 6 86811 15 2 22244 1 45 181373 49 7 3544 15 12 403604 46 8 690720 37 28 263412 1 40 71370 12 48 28404 8 21 7326 15 43 332310 12 11 690228 21 27 75225 46 3 442950 2 25 297960 15 4 267467 45 5 13432 12 35 141492 27 23 215600 3 34 369600 37 9 4905 12 14 300744 14 19 364040 27 20 382396 49 10 641823 2 41 81153 9 32 167510 5 44 271219 4 16 11184 23 29 275502 11 42 432078 14 18 16965 48 33 273456 23 39 139384 40 31 97567 4 26 188246 16 47 138980 8 22 172577 33 36 111230 7 30 21054 3 17 41181 5 13 528858 29 50 240760 43 47 277514 36 41 842506 13 33 186456 34 9 21403 43 45 459825 25 37 336474 24 17 141200 11 50 513535 34 17 504672 36 7 4802 33 36 867825 23 46 438080 33 38 472428 27 37 137200 4 14 12768 40 38 559647 2 48 738568 7 14 164388 39 29 200506 35 1 197524 33 30 1466 32 43 47244 26 34 146772 22 14 375396 4 23 362168 49 17 155016 27 22 231660 5 25 367584 11 44 781568 39 36 356481 22 50 597300 14 27 8168 19 5 5796 12 24 107141 10 2 3480 8 20 13870 5 31 537591 46 50 682864 41 12 36900 14 31 385176 46 32 438240 38 44 278784 23 33 24855 20 37 124640 23 17 56100 43 19 22176 4 49 434241 21 28 137952 5 18 161568 18 37 176190 22 4 309675 10 31 619548 46 5 206796 17 30 195552 48 14 479076 25 25 100744 33 6 308913 34 16 70252 32 34 60096 40 9 58312 24 25 199800 48 20 940975 39 35 604435 13 27 437852 42 13 82490 16 42 60030 1 16 695520 22 29 544479 25 34 347529 15 28 559302 5 22 77670 17 44 334730 12 34 172676 38 33 640533 42 18 245232 9 49 134067 39 13 59784 39 45 452956 47 5 156144 15 35 62434 40 40 66185 22 4 72220 44 38 9345 2 30 52908 29 23 775795 38 14 561150 38 46 221040 29 12 122920 1 28 754444 31 23 297570 14 50 729150 45 35 133163 23 49 618300 26 29 312698 21 31 127428 28 39 259644 32 24 84576 27 10 3081 27 1 125928 30 27 465660 23 4 198066 11 35 536400 7 22 763152 25 29 31218 46 27 197547 16 37 176700 33 20 46629 43 22 486783 1 28 797534 44 30 483055 28 9 144676 28 49 172692 26 15 273916 48 27 72267 49 8 107793 16 37 648375 47 35 450730 28 11 97118 38 8 128280 41 17 16264 21 42 7362 22 3 38222 13 45 25545 24 41 87945 25 18 641704 5 30 865890 11 13 91368 15 2 294 5 39 502860 27 42 207162 34 37 649272 40 3 797760 17 46 673816 14 37 171133 40 41 397432 43 26 209860 20 13 377578 3 22 129602 40 16 113982 30 46 324170 24 14 226278 40 37 588795 38 38 50015 15 10 1438 28 46 585600 29 22 144485 30 41 410167 9 43 522180 20 44 328968 16 34 88950 ------- test 11 ---- 200 100 1 4 17085 4 28 189225 28 16 63288 4 2 759330 16 62 414178 2 36 329440 4 95 583020 1 69 197298 36 80 826454 80 27 113169 80 68 46128 36 96 314100 96 3 144330 62 85 606276 85 32 533664 28 24 228683 3 23 41938 36 41 235512 2 81 186348 80 77 673456 16 94 53760 28 47 116987 80 56 23358 3 15 226238 62 63 641900 41 54 67104 77 92 18080 80 37 18210 77 30 63600 2 93 528 27 7 30618 69 66 164679 81 60 204435 23 59 113924 85 61 667234 16 12 314560 94 73 60540 92 43 64864 95 42 78672 56 39 7450 54 31 383474 96 8 378144 60 21 132550 77 45 501228 32 34 18296 39 83 699100 77 74 428168 31 78 577348 77 44 360308 85 72 219516 80 25 242208 68 38 397244 44 84 338688 96 76 94952 27 64 450300 32 51 121770 95 79 66774 64 82 425295 84 90 43204 81 65 154175 74 40 21280 72 26 36400 76 18 31994 73 46 138437 84 98 10650 92 70 210120 54 11 142410 28 10 109740 66 14 336050 93 35 283272 66 48 143118 48 58 670842 59 75 57928 3 89 23560 28 53 150960 36 71 412850 32 97 267540 76 33 142679 76 5 124960 89 20 801073 44 55 322368 93 22 167139 55 57 267267 33 17 16659 51 87 67580 81 13 345840 40 9 368874 53 50 546845 46 52 290168 61 86 359904 92 29 158116 46 49 3084 76 19 250523 7 6 339957 77 88 255360 80 67 617056 81 91 198496 10 99 699152 62 100 50268 68 33 88892 83 70 523625 39 28 358620 49 80 247150 74 4 618017 97 42 489 16 83 183690 19 36 162648 95 29 8520 51 94 667554 73 63 19116 22 49 25715 89 37 40712 9 42 23484 38 79 1664 20 93 519360 39 92 478080 68 36 28536 33 21 468534 79 15 825968 86 80 193629 97 43 158484 10 43 449445 9 25 132940 79 98 2225 77 39 494856 90 57 7872 92 86 57204 1 41 32648 32 95 48815 4 13 14525 33 99 151704 6 89 170148 74 64 109214 21 93 97524 82 89 117819 68 95 218337 36 67 511648 95 93 284171 89 98 17072 7 72 206205 10 84 67746 2 15 418095 25 66 510300 31 82 75900 84 40 505300 66 51 135366 31 23 901048 74 20 41076 85 91 444726 13 74 309582 48 73 198288 33 8 476470 7 13 447492 96 22 644787 61 87 413376 5 73 154440 56 90 46995 40 88 279105 32 83 233232 23 44 255424 85 100 490842 73 7 57022 39 21 334356 96 34 56800 32 4 733125 70 41 759782 13 85 36925 49 28 120888 54 32 256200 85 71 599874 75 72 745752 53 73 432174 73 70 257890 92 81 444988 76 81 22609 67 62 789351 4 52 32844 24 46 195975 34 100 83454 77 25 260160 95 42 636572 2 22 341784 65 92 499310 33 15 580903 73 23 107787 83 30 280178 32 84 382230 79 93 160881 68 87 630240 93 45 215514 72 53 597958 6 20 88416 59 20 620682 63 85 166897 40 16 102355 70 42 481932 10 90 91377 68 95 446896 44 14 51465 48 77 101680 ------- test 12 ---- 0 2 Keep up the good work! Thanks for your submission!