思路
明显的最大权闭合子图,把实验和器材连边,并且变通一下边权,求最大流并记录最小割上的点即可。输入输出略显毒瘤。
代码
// LOJ6001.cpp #include <bits/stdc++.h> using namespace std; const int MAX_N = 2000, INF = 0x3f3f3f3f; int m, n, s, t, head[MAX_N], current, cur[MAX_N], dep[MAX_N], tmpx; bool vis[MAX_N]; string tmp; struct edge { int to, nxt, weight; } edges[MAX_N << 2]; void addpath(int src, int dst, int weight) { edges[current].to = dst, edges[current].nxt = head[src]; edges[current].weight = weight, head[src] = current++; } bool bfs() { memset(dep, 0, sizeof(dep)), memset(vis, 0, sizeof(vis)); queue<int> q; q.push(s), dep[s] = 1; do { int u = q.front(); q.pop(), vis[u] = true; for (int i = head[u]; i != -1; i = edges[i].nxt) if (edges[i].weight > 0 && !dep[edges[i].to]) dep[edges[i].to] = dep[u] + 1, q.push(edges[i].to); } while (!q.empty()); return dep[t] != 0; } int dfs(int u, int flow) { if (u == t || flow == 0) return flow; for (int &i = cur[u]; i != -1; i = edges[i].nxt) if (dep[edges[i].to] == dep[u] + 1 && edges[i].weight > 0) { int to = edges[i].to, fl = dfs(to, min(flow, edges[i].weight)); if (fl > 0) { edges[i].weight -= fl, edges[i ^ 1].weight += fl; return fl; } } return 0; } int dinic() { int ans = 0; while (bfs()) { for (int i = 1; i <= n + m + 2; i++) cur[i] = head[i]; while (int flow = dfs(s, INF)) ans += flow; } return ans; } int main() { memset(head, -1, sizeof(head)); scanf("%d%d\n", &m, &n); s = n + m + 1, t = s + 1; int ans = 0; for (int i = 1; i <= m; i++) { getline(cin, tmp); stringstream ss; ss << tmp, ss >> tmpx; addpath(s, i, tmpx), addpath(i, s, 0); ans += tmpx; while (ss >> tmpx) addpath(i, tmpx + m, INF), addpath(tmpx + m, i, 0); } for (int i = 1; i <= n; i++) scanf("%d", &tmpx), addpath(i + m, t, tmpx), addpath(t, i + m, 0); ans -= dinic(); queue<int> q; for (int i = 1; i <= m; i++) if (vis[i]) q.push(i); while (!q.empty()) { int pt = q.front(); q.pop(), printf("%d", pt); if (!q.empty()) printf(" "); } puts(""); for (int i = 1; i <= n; i++) if (vis[i + m]) q.push(i); while (!q.empty()) { int pt = q.front(); q.pop(), printf("%d", pt); if (!q.empty()) printf(" "); } puts(""); printf("%d", ans); return 0; }