Submission #940888

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
940888	2024-03-08 00:48:46	Pacybwoah	Village (BOI20_village)	C++17	50 / 100	107 ms	22368 KiB

Village

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#include<iostream>
#include<vector>
using namespace std;
vector<vector<int> > graph;
vector<int> match,prem;
vector<vector<int> > dp;
void dfs_min(int node,int parent){
    for(auto x:graph[node]){
        if(x==parent) continue;
        dfs_min(x,node);
        dp[node][0]+=max(dp[x][0],dp[x][1]);
    }
    for(auto x:graph[node]){
        if(x==parent) continue;
        if(dp[node][1]<dp[node][0]-max(dp[x][0],dp[x][1])+dp[x][0]+1){
            dp[node][1]=dp[node][0]-max(dp[x][0],dp[x][1])+dp[x][0]+1;
            prem[node]=x;
        }
    }
}
void dfs_match(int node,int parent,bool flag){
    if(flag||dp[node][0]>=dp[node][1]){
        for(auto x:graph[node]){
            if(x==parent) continue;
            dfs_match(x,node,0);
        }
    }
    else{
        match[node]=prem[node];
        match[prem[node]]=node;
 
 
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• Subtask 1: 6 / 12
• Subtask 2: 19 / 38
• Subtask 3: 25 / 50