1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
| #include <iostream> #include <cstdio> #include <queue> #include <climits> #define INF INT_MAX using namespace std; const int N = 110, M = 3e4 + 10; bool vis[N]; int n, st, ed, d[N], pre[N], incf[N]; int idx = -1, hd[N], nxt[M], edg[M], wt[M], f[M]; bool spfa () { for (int i = st; i <= ed; i++) incf[i] = 0; for (int i = st; i <= ed; i++) d[i] = INF; incf[st] = INF; d[st] = 0; queue <int> q; q.push(st); vis[st] = true; while (!q.empty()) { int t = q.front(); q.pop(); vis[t] = false; for (int i = hd[t]; ~i; i = nxt[i]) if (d[t] + f[i] < d[edg[i]] && wt[i]) { d[edg[i]] = d[t] + f[i]; pre[edg[i]] = i; incf[edg[i]] = min(wt[i], incf[t]); if (!vis[edg[i]]) { vis[edg[i]] = true; q.push(edg[i]); } } } return incf[ed] > 0; } int ek () { int res = 0; while (spfa()) { int t = incf[ed]; res += t * d[ed]; for (int i = ed; i != st; i = edg[pre[i] ^ 1]) { wt[pre[i]] -= t; wt[pre[i] ^ 1] += t; } } return res; } void add (int a, int b, int c, int d) { nxt[++idx] = hd[a]; hd[a] = idx; edg[idx] = b; wt[idx] = c; f[idx] = d; } int main () { cin >> n; st = 0; ed = n << 1 | 1; for (int i = st; i <= ed; i++) hd[i] = -1; for (int i = 1; i <= n; i++) { add(st, i, 1, 0); add(i, st, 0, 0); } for (int i = 1, a; i <= n; i++) for (int j = n + 1; j < ed; j++) { cin >> a; add(i, j, 1, a); add(j, i, 0, -a); } for (int i = n + 1; i < ed; i++) { add(i, ed, 1, 0); add(ed, i, 0, 0); } cout << ek() << endl; for (int i = 0; i <= idx; i += 2) { wt[i] += wt[i ^ 1]; wt[i ^ 1] = 0; f[i] = -f[i]; f[i ^ 1] = -f[i ^ 1]; } cout << -ek(); return 0; }
|