제출 #1073316

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1073316		Unforgettablepl	봉쇄 시간 (IOI23_closing)	C++17	0 / 100	838 ms	2097152 KiB

closing

#include "closing.h"
#include <bits/stdc++.h>
using namespace std;

const long long INF = 1e18+1;

int max_score(int N,int X,int Y,long long K,
              vector<int> U,vector<int> V,vector<int> W){
    vector<vector<pair<int,long long>>> adj(N);
    for(int i=0;i<N-1;i++) {
        adj[U[i]].emplace_back(V[i],W[i]);
        adj[V[i]].emplace_back(U[i],W[i]);
    }
    vector<long long> distX(N);
    vector<long long> distY(N);
    auto dijkastra = [&](int x) {
        priority_queue<pair<long long,int>> pq;
        pq.emplace(0,x);
        vector<bool> visited(N);
        while(!pq.empty()) {
            auto [dist,idx] = pq.top();pq.pop();dist=-dist;
            if(visited[idx])continue;
            visited[idx]=true;
            distX[idx]=dist;
            for(auto[v,c]:adj[idx])if(!visited[v])pq.emplace(-dist-c,v);
        }
    };
    dijkastra(Y);
    swap(distX,distY);
    dijkastra(X);
    vector cost1(N+1,0ll);
    vector cost2(N+1,0ll);
    for(int i=0;i<N;i++) {
        long long mini = min(distX[i],distY[i]);
        long long maxi = max(distX[i],distY[i]);
        cost1[i+1] = mini;
        cost2[i+1] = maxi;
    }
    vector DP(N+1,vector(2*N+1,INF));
    DP[0][0]=0;
    for(int i=1;i<=N;i++) {
        DP[i][0]=0;
        DP[i][1]=min(DP[i-1][1],cost1[i]);
        for(int j=2;j<=2*N;j++) {
            DP[i][j]=min({DP[i-1][j],DP[i-1][j-1]+cost1[i],DP[i-1][j-2]+cost2[i]});
        }
    }
    for(int j=2*N;j;j--)if(DP[N][j]<=K)return j;
    assert(false);
}

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