46 lines
721 B
C++
46 lines
721 B
C++
#include <algorithm>
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#include <climits>
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#include <iostream>
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#include <vector>
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const int MAX_N = 1.5e5+5;
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int n;
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std::vector<int> v[MAX_N];
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int dp[MAX_N][2];
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void dfs(const int n,const int f){
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for(auto &i:v[n]){
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if(i!=f)dfs(i, n);
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else continue;
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dp[n][1]+=std::min(dp[i][0],dp[i][1]);
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dp[n][0]+=dp[i][1];
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}
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}
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int main(){
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std::cin>>n;
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for(int _i=0;_i<n;_i++){
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dp[_i][1]=1;
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int i,k;
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std::cin>>i>>k;
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for(int j=1;j<=k;j++){
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int r;
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std::cin>>r;
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v[i].push_back(r);
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v[r].push_back(i);
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}
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}
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dfs(0,-1);
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std::cout<<std::min(dp[0][1],dp[0][0]);
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}
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/*
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4
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0 1 1
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1 2 2 3
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2 0
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3 0
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*/ |