HDU 1054 树型dp
来源:程序员人生 发布时间:2015-08-04 07:46:58 阅读次数:2230次
#include <cstdio>
#include <iostream>
#include <algorithm>
#include <queue>
#include <stack>
#include <climits>
#include <cstring>
#include <cmath>
#include <map>
#include <set>
#define INF 100000000
using namespace std;
int n;
vector<int> ma[1515];
int dp[1510];
int fun(int x){
//cout << x << ' ' << vis[x] << endl;
if(dp[x]) return dp[x];
int len = ma[x].size();
int tm1 = 1;
for(int i =0 ;i < len;i++){
int q = ma[x][i];
if(ma[q].size()){
tm1 += fun(q);
}
}
//cout << tm1 << endl;
int tm2 = len; //自己不放
for(int i = 0;i < len;i++){
int q = ma[x][i];
int lenq = ma[q].size();
for(int j = 0;j < lenq;j++){
int p = ma[q][j];
if(ma[p].size()){
tm2 += fun(p);
}
}
}
//cout <<tm1 << " aa " << tm2 << endl;
return dp[x] = min(tm1,tm2);
}
int main(){
//freopen("1.txt","r",stdin);
while(cin >> n){
for(int i = 0;i < n;i++){
ma[i].clear();
}
int v,a,m,s;
for(int i = 0;i < n;i++){
scanf("%d:(%d)",&v,&m);
if(i == 0){
s = v;
}
for(int j = 0;j < m;j++){
scanf("%d",&a);
ma[v].push_back(a); //建树
}
}
memset(dp,0,sizeof(dp));
fun(s);
printf("%d
",dp[s]);
}
return 0;
}
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