Submission #50988

#	Time	Username	Problem	Language	Result	Execution time	Memory
50988		aquablitz11	Crocodile's Underground City (IOI11_crocodile)	C++14	100 / 100	851 ms	102160 KiB

crocodile

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

using ll = long long;
using pii = pair<int, int>;
using pli = pair<ll, int>;

#define F first
#define S second

const int N = 150010;
const ll INF = 1e18;

ll dist1[N], dist2[N];
bool vis[N];
vector<pii> G[N];

int travel_plan(int n, int m, int R[][2], int L[], int k, int P[])
{
    fill(dist1, dist1+n, INF);
    fill(dist2, dist2+n, INF);
    for (int i = 0; i < m; ++i) {
        int u = R[i][0], v = R[i][1], w = L[i];
        G[u].push_back({v, w});
        G[v].push_back({u, w});
    }

    priority_queue<pli, vector<pli>, greater<pli>> Q;
    for (int i = 0; i < k; ++i) {
        dist1[P[i]] = dist2[P[i]] = 0;
        Q.push({0, P[i]});
    }

    while (!Q.empty()) {
        int u = Q.top().second;
        Q.pop();
        if (vis[u]) continue;
        vis[u] = true;
        for (auto v : G[u]) if (!vis[v.F]) {
            bool mod = false;
            if (dist2[u]+v.S < dist1[v.F]) {
                dist2[v.F] = dist1[v.F];
                dist1[v.F] = dist2[u]+v.S;
                mod = true;
            } else if (dist2[u]+v.S < dist2[v.F]) {
                dist2[v.F] = dist2[u]+v.S;
                mod = true;
            }
            if (mod && dist2[v.F] < INF)
                Q.push({dist2[v.F], v.F});
        }
    }

    return dist2[0];
}

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