Submission #1154971

#	Time	Username	Problem	Language	Result	Execution time	Memory
1154971		njoop	Crocodile's Underground City (IOI11_crocodile)	C++20	100 / 100	255 ms	44820 KiB

crocodile

#include "crocodile.h"
#include <bits/stdc++.h>
#define pi pair<int, int>
using namespace std;

vector<pair<int, int>> g[100010];
priority_queue<pi> pq;
int dis[100010][2], cd, cn, nd, nn;

int travel_plan(int N, int M, int R[][2], int L[], int K, int P[]) {
    for(int i=0; i<M; i++) {
        g[R[i][0]].push_back({R[i][1], L[i]});
        g[R[i][1]].push_back({R[i][0], L[i]});
    }
    for(int i=0; i<=N; i++) {
        dis[i][0] = 1e9;
        dis[i][1] = 1e9;
    }
    for(int i=0; i<K; i++) {
        pq.push({0, P[i]});
        dis[P[i]][0] = 0;
        dis[P[i]][1] = 0;
    }
    while(pq.size()) {
        cd = pq.top().first;
        cn = pq.top().second;
        pq.pop();
        cd = -cd;
        if(dis[cn][1] < cd) continue;
        for(auto i: g[cn]) {
            nn = i.first;
            nd = cd + i.second;
            if(nd < dis[nn][0]) {
                if(dis[nn][0] < dis[nn][1]) pq.push({-dis[nn][0], nn});
                dis[nn][1] = dis[nn][0];
                dis[nn][0] = nd;
            } else if(nd < dis[nn][1]) {
                dis[nn][1] = nd;
                pq.push({-nd, nn});
            }
        }
    }
    return dis[0][1];
}

• Subtask 1: 46 / 46
• Subtask 2: 43 / 43
• Subtask 3: 11 / 11