제출 #1199677

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1199677		herissonwow2	Race (IOI11_race)	C++20	0 / 100	0 ms	320 KiB

race

#include "race.h"
#include <vector>
#include <queue>
#include <iostream>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")

using namespace std;
const int N = 200001;
int att[N];
int biju[N];
int len[N];
vector<vector<pair<int,int>>> g;
void DFS(int v1){
    for(auto p : g[v1]){
        if(!biju[p.second]){
            att[p.second] = att[v1] + att[p.first];
            len[p.second] = len[v1] + 1;
            DFS(p.second);
        }
    }
}

int best_path(int N, int K, int H[][2], int L[])
{
    for(int i = 0;i < N - 1;i++)
    {
        int u = H[i][0], v = H[i][1], w = L[i];
        g[u].push_back({v, w});
        g[v].push_back({u, w});
    }
    int res = -1;
    for(int i = 0; i < N; i++){
        //fill(att,att+N, 0);
        fill(biju,biju+N, 0);
        att[i] = len[i] = 0;
        biju[i] = 1;
        DFS(i);
        for(int j = 0;j < N;j++)
            if(att[j] == K && (res == -1 || len[j] < res))
                res = len[j];
    }
    //cout << res/2;
    return res;

}

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