HDU1054 Strategic Game

题面:http://acm.hdu.edu.cn/showproblem.php?pid=1054

本题是求树的最小点覆盖裸题。Code:
#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<cstdlib>
#include<algorithm>
#include<ctime>
using namespace std;
const int N=6005;
int n,f[N][2],Head[N],Cnt;
bool vis[N];
struct Node{int v,Next;
}Edge[N*2];
void Push(int u,int v){++Cnt;Edge[Cnt].v=v;Edge[Cnt].Next=Head[u];Head[u]=Cnt;
}
void dfs(int u,int fa){f[u][0]=0;f[u][1]=1;for(int i=Head[u];i;i=Edge[i].Next){int v=Edge[i].v;if(v==fa){continue;}dfs(v,u);f[u][0]+=f[v][1];f[u][1]+=min(f[v][0],f[v][1]);}
}
int main(){while(~scanf("%d",&n)){memset(Head,0,sizeof(Head));Cnt=0;for(int i=1;i<=n;i++){int u,k;scanf("%d:(%d)",&u,&k);u++;for(int j=1;j<=k;j++){int v;scanf("%d",&v);v++;Push(u,v);Push(v,u);}}memset(f,0,sizeof(f));dfs(1,0);printf("%d\n",min(f[1][0],f[1][1]));}return 0;
}

转载于:https://www.cnblogs.com/ukcxrtjr/p/11243533.html

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