usaco-4.1-ditch-passed

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!