Submission #1109331

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109331		nh0902	Robot (JOI21_ho_t4)	C++17	0 / 100	222 ms	33336 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int N = 110000;

long long const inf = 1e16;

int n, m;

long long D[N];

bool vst[N];

vector<pair<int, long long>> g[N];

vector<pair<int, pair<int, long long>>> v[N];

struct cmp{
    bool operator() (pair<long long, int> a, pair<long long, int> b) {
        return a.first > b.first;
    }
};

struct cmp2{
    bool operator() (pair<pair<long long, int>, int> a, pair<pair<long long, int>, int> b) {
        return a.first.first > b.first.first;
    }
};

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> m;

    int a, b, c;
    long long p;

    for (int i = 1; i <= m; i ++) {
        cin >> a >> b >> c >> p;
        v[a].push_back({b, {c, p}});
        v[b].push_back({a, {c, p}});
    }

    for (int i = 1; i <= n; i ++) {
        map<int, long long> m;
        for (auto e : v[i]) {
            if (m.find(e.second.first) == m.end()) {
                m[e.second.first] = 0;
            }
            m[e.second.first] += e.second.second;
        }

        for (auto e : v[i]) {
            //cout << i << " " << e.first << " : " << m[e.second.first] - e.second.second << "\n";
            g[i].push_back({e.first, min(e.second.second, m[e.second.first] - e.second.second)});
        }
    }

    priority_queue<pair<long long, int>, vector<pair<long long, int>>, cmp> pq;

    for (int i = 1; i <= n; i ++) {
        D[i] = inf;
    }

    D[1] = 0;
    pq.push({0, 1});

    while (!pq.empty()) {
        auto [d, x] = pq.top();
        pq.pop();

        if (vst[x]) continue;

        vst[x] = true;

        for (auto e : g[x]) {
            if (D[e.first] > d + e.second) {
                D[e.first] = d + e.second;
                pq.push({D[e.first], e.first});
            }
        }
    }
    if (D[n] == inf) {
        cout << -1;
        return 0;
    }
    cout << D[n];

    return 0;
}

• Subtask 1: 0 / 34
• Subtask 2: 0 / 24
• Subtask 3: 0 / 42