Submission #939615

#	Time	Username	Problem	Language	Result	Execution time	Memory
939615		May27_th	Crocodile's Underground City (IOI11_crocodile)	C++17	0 / 100	3 ms	8792 KiB

crocodile

#include<bits/stdc++.h>
#define taskname "A"
using namespace std;

const int MOD = 1e9 + 7;
const int MAXN = 2e5 + 10;
const int INF = 1e9;

int par[MAXN]; vector<pair<int, int64_t>> G[MAXN];

int64_t travel_plan(int N, int M, int R[][2], int L[], int K, int st[]){
    cin >> N >> M >> K;
    for (int i = 0; i < M; i ++) {
        cin >> R[i][0] >> R[i][1];
    }
    for (int i = 0; i < M; i ++) {
        G[R[i][0]].push_back(make_pair(R[i][1], L[i]));
        G[R[i][1]].push_back(make_pair(R[i][0], L[i]));
    }
    priority_queue<pair<int64_t, int>> pq;
    vector<int64_t> f(N + 5, 1e18);
    for (int i = 0; i < K; i ++) {
        cin >> st[i]; f[st[i]] = 0;
        pq.push(make_pair(0, st[i]));
    }
    while (!pq.empty()) {
        int64_t d; int u; tie(d, u) = pq.top(); pq.pop();
        if (-d != f[u]) continue;
        for (auto [v, w] : G[u]) {
            if (f[v] > f[u] + w) {
                f[v] = f[u] + w;
                par[v] = u;
                pq.push(make_pair(-f[v], v));
            }
        }
    }
    for (int i = 0; i < N; i ++) f[i] = 1e18;

    f[0] = 0; pq.push(make_pair(f[0], 0));
    while (!pq.empty()) {
        int64_t d; int u; tie(d, u) = pq.top(); pq.pop();
        if (-d != f[u]) continue;
        for (auto [v, w] : G[u]) {
            if (par[u] != v && f[v] > f[u] + w) {
                f[v] = f[u] + w;
                pq.push(make_pair(-f[v], v));
            }
        }
    }
    int64_t ans = 1e18;
    for (int i = 0; i < K; i ++) {
        ans = min(ans, f[st[i]]);
    }
    return ans;
}

• Subtask 1: 0 / 46
• Subtask 2: 0 / 43
• Subtask 3: 0 / 11