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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#481315#602. 最小费用最大流(随机数据)james1BadCreeper#0 0ms0kbC++172.2kb2024-07-16 23:32:482024-07-16 23:32:49

Judging History

你现在查看的是最新测评结果

  • [2024-07-16 23:32:49]
  • 评测
  • 测评结果:0
  • 用时:0ms
  • 内存:0kb
  • [2024-07-16 23:32:48]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std; 
const int N = 5e3 + 5; 

struct Graph {
    struct edge {
        int u, v, w, c;
        edge(int u = 0, int v = 0, int w = 0, int c = 0) : 
            u(u), v(v), w(w), c(c) {}
    };
 
    int n, m, s, t, cur[N], d[N];
    bool inq[N];
    vector<int> G[N];
    vector<edge> edges;
 
    inline void add(int u, int v, int w, int c) {
        edges.emplace_back(u, v, w, c);
        G[u].emplace_back(edges.size() - 1); 
        edges.emplace_back(v, u, 0, -c);
        G[v].emplace_back(edges.size() - 1); 
    }
 
    bool SPFA(void) {
        memset(cur, 0, sizeof(cur));
        memset(d, 0x3f, sizeof(d));
        queue<int> q; q.push(s); d[s] = 0; inq[s] = 1; 
        while (!q.empty()) {
            int u = q.front(); q.pop(); inq[u] = 0; 
            for (int i = 0; i < G[u].size(); ++i) {
                edge &e = edges[G[u][i]];
                if (e.w && d[e.v] > d[u] + e.c) {
                    d[e.v] = d[u] + e.c;
                    if (!inq[e.v]) q.push(e.v), inq[e.v] = 1; 
                }
            }
        }
        return d[t] < 0x3f3f3f3f;
    }
 
    int cost, vis[N]; 
    int dinic(int x, int res) {
        if (x == t) return res; 
        int flow = 0; vis[x] = 1; 
        for (int i = cur[x]; i < G[x].size() && res; ++i) {
            cur[x] = i; edge &e = edges[G[x][i]]; 
            int c = min(res, e.w); 
            if (!vis[e.v] && c && d[e.v] == d[x] + e.c) {
                int k = dinic(e.v, c); 
                flow += k; cost += k * e.c; res -= k; 
                e.w -= k; edges[G[x][i] ^ 1].w += k; 
            }
        }
        if (!flow) d[x] = 0x3f3f3f3f; vis[x] = 0; 
        return flow; 
    }
    int maxflow, flow; 
    int MCMF(int S, int T) {
        s = S; t = T; maxflow = 0; 
        while (SPFA()) while (flow = dinic(s, 1e9)) maxflow += flow;
        return cost; 
    }
} G;  

int n, m, s, t; 

main(void) {
    cin >> n >> m >> s >> t; 
    while (m--) {
        int u, v, w, c; cin >> u >> v >> w >> c; 
        G.add(u, v, w, c); 
    }
    int cost = G.MCMF(s, t); 
    cout << G.maxflow << " " << cost << "\n"; 
    return 0; 
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 0
Runtime Error

input:

8 27
2 3 2147483647 100
1 3 1 100
2 4 2147483647 10
1 4 1 10
2 4 2147483647 10
1 4 1 10
2 8 3 0
3 5 2147483647 100
1 5 1 100
3 8 1 0
3 2 2147483647 0
4 5 2147483647 10
1 5 1 10
4 8 1 0
4 2 2147483647 0
5 6 2147483647 1
1 6 1 1
5 6 2147483647 1
1 6 1 1
5 7 2147483647 1
1 7 1 1
5 8 3 0
5 2 2147483647 ...

output:


result:


Test #2:

score: 0
Runtime Error

input:

12 49
2 10 2147483647 5
1 10 1 5
2 5 2147483647 50
1 5 1 50
2 9 2147483647 8
1 9 1 8
2 8 2147483647 47
1 8 1 47
2 11 2147483647 17
1 11 1 17
2 12 5 0
3 12 0 0
3 2 2147483647 0
4 6 2147483647 18
1 6 1 18
4 11 2147483647 12
1 11 1 12
4 9 2147483647 14
1 9 1 14
4 12 3 0
4 2 2147483647 0
5 11 2147483647...

output:


result:


Test #3:

score: 0
Runtime Error

input:

27 169
2 15 2147483647 24
1 15 1 24
2 19 2147483647 96
1 19 1 96
2 12 2147483647 49
1 12 1 49
2 13 2147483647 75
1 13 1 75
2 24 2147483647 2
1 24 1 2
2 27 5 0
3 27 0 0
3 2 2147483647 0
4 11 2147483647 99
1 11 1 99
4 3 2147483647 85
1 3 1 85
4 27 2 0
4 2 2147483647 0
5 27 0 0
5 2 2147483647 0
6 9 214...

output:


result:


Test #4:

score: 0
Runtime Error

input:

77 2149
2 42 2147483647 33
1 42 1 33
2 68 2147483647 30
1 68 1 30
2 76 2147483647 13
1 76 1 13
2 51 2147483647 93
1 51 1 93
2 12 2147483647 39
1 12 1 39
2 57 2147483647 74
1 57 1 74
2 70 2147483647 21
1 70 1 21
2 73 2147483647 24
1 73 1 24
2 52 2147483647 54
1 52 1 54
2 15 2147483647 99
1 15 1 99
2 ...

output:


result:


Test #5:

score: 0
Runtime Error

input:

102 4199
2 48 2147483647 42
1 48 1 42
2 85 2147483647 50
1 85 1 50
2 22 2147483647 83
1 22 1 83
2 95 2147483647 97
1 95 1 97
2 82 2147483647 34
1 82 1 34
2 25 2147483647 72
1 25 1 72
2 4 2147483647 17
1 4 1 17
2 47 2147483647 10
1 47 1 10
2 71 2147483647 12
1 71 1 12
2 68 2147483647 39
1 68 1 39
2 2...

output:


result:


Test #6:

score: 0
Runtime Error

input:

102 4199
2 79 2147483647 13
1 79 1 13
2 83 2147483647 73
1 83 1 73
2 75 2147483647 90
1 75 1 90
2 30 2147483647 92
1 30 1 92
2 54 2147483647 25
1 54 1 25
2 66 2147483647 53
1 66 1 53
2 52 2147483647 37
1 52 1 37
2 63 2147483647 46
1 63 1 46
2 11 2147483647 20
1 11 1 20
2 55 2147483647 53
1 55 1 53
2...

output:


result:


Test #7:

score: 0
Runtime Error

input:

102 4199
2 39 2147483647 45
1 39 1 45
2 51 2147483647 11
1 51 1 11
2 86 2147483647 63
1 86 1 63
2 23 2147483647 46
1 23 1 46
2 48 2147483647 63
1 48 1 63
2 87 2147483647 8
1 87 1 8
2 73 2147483647 63
1 73 1 63
2 5 2147483647 52
1 5 1 52
2 80 2147483647 21
1 80 1 21
2 31 2147483647 44
1 31 1 44
2 101...

output:


result:


Test #8:

score: 0
Runtime Error

input:

302 10599
2 72 2147483647 169
1 72 1 169
2 260 2147483647 165
1 260 1 165
2 12 2147483647 108
1 12 1 108
2 16 2147483647 26
1 16 1 26
2 28 2147483647 148
1 28 1 148
2 7 2147483647 74
1 7 1 74
2 139 2147483647 199
1 139 1 199
2 231 2147483647 9
1 231 1 9
2 287 2147483647 123
1 287 1 123
2 135 2147483...

output:


result:


Test #9:

score: 0
Runtime Error

input:

302 10599
2 222 2147483647 132
1 222 1 132
2 17 2147483647 7
1 17 1 7
2 177 2147483647 253
1 177 1 253
2 90 2147483647 195
1 90 1 195
2 128 2147483647 289
1 128 1 289
2 42 2147483647 193
1 42 1 193
2 213 2147483647 133
1 213 1 133
2 263 2147483647 293
1 263 1 293
2 50 2147483647 155
1 50 1 155
2 228...

output:


result:


Test #10:

score: 0
Runtime Error

input:

302 10599
2 176 2147483647 289
1 176 1 289
2 190 2147483647 99
1 190 1 99
2 10 2147483647 96
1 10 1 96
2 240 2147483647 165
1 240 1 165
2 273 2147483647 205
1 273 1 205
2 248 2147483647 194
1 248 1 194
2 220 2147483647 122
1 220 1 122
2 194 2147483647 167
1 194 1 167
2 8 2147483647 67
1 8 1 67
2 227...

output:


result: