pta L2-013. 红色警报

来源：互联网发布：购物软件哪个好编辑：程序博客网时间：2024/05/23 11:29

并查集和dfs都可以，注意时当苏搜有程序都失去时才输出”Game Over.“。

#include <bits/stdc++.h>using namespace std;int n, m, cnt;int maps[510][510];bool vis2[510], vis[510];void dfs(int u) {    for(int i = 0; i<n; ++i) {        if(!vis2[i]&&maps[u][i]&&!vis[i]) {            vis[i] = 1;            dfs(i);        }    }}int main() {    scanf("%d%d", &n, &m);    int u, v;    memset(maps, 0, sizeof(maps));    for(int i = 0; i<m; ++i) {        scanf("%d%d", &u, &v);        maps[u][v] = maps[v][u] = 1;    }    memset(vis2, 0, sizeof(vis2));    int nn;    scanf("%d", &nn);    for(int ii = 1; ii<=nn; ++ii) {        scanf("%d", &u);        cnt = 0;        memset(vis, 0, sizeof(vis));        for(int i = 0; i<n; ++i)            if(!vis2[i]&&!vis[i]) {                vis[i] = 1;                dfs(i);                cnt--;            }        //    printf("cnt = %d ", cnt);        memset(vis, 0, sizeof(vis));        vis2[u] = 1;        for(int i = 0; i<n; ++i)            if(!vis2[i]&&!vis[i]) {                vis[i] =1;                dfs(i);                cnt++;            }          //  printf("%d \n", cnt);        if(cnt>=1)printf("Red Alert: City %d is lost!\n", u);        else printf("City %d is lost.\n", u);    }    if(nn==n)printf("Game Over.\n");    return 0;}

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