Submission #582710

#	Time	Username	Problem	Language	Result	Execution time	Memory
582710		stevancv	Crocodile's Underground City (IOI11_crocodile)	C++14	100 / 100	512 ms	64496 KiB

crocodile

#include <bits/stdc++.h>
#include "crocodile.h"
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
int travel_plan(int n, int m, int r[][2], int l[], int k, int p[]) {
    vector<vector<pair<int, int>>> g(n);
    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]});
    }
    vector<int> was(n);
    vector<ll> da(n, 1e18), db(n, 1e18);
    priority_queue<pair<ll, pair<int, int>>> pq;
    for (int i = 0; i < k; i++) {
        was[p[i]] = 1;
        da[p[i]] = db[p[i]] = 0;
        pq.push({0, {p[i], -1}});
    }
    while (!pq.empty()) {
        auto xyz = pq.top();
        pq.pop();
        ll x = -xyz.first;
        int y = xyz.second.first;
        int z = xyz.second.second;
        was[y]++;
        if (was[y] != 2) continue;
        for (auto u : g[y]) {
            if (u.first == z) continue;
            ll di = x + u.second;
            if (da[u.first] > di) {
                db[u.first] = da[u.first];
                da[u.first] = di;
                pq.push({-di, {u.first, y}});
            }
            else if (db[u.first] > di) {
                db[u.first] = di;
                pq.push({-di, {u.first, y}});
            }
        }
    }
    return db[0];
}

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