Submission #806650

#	Time	Username	Problem	Language	Result	Execution time	Memory
806650		vjudge1	Robot (JOI21_ho_t4)	C++17	0 / 100	84 ms	9956 KiB

Main

#ifdef Home
#define _GLIBCXX_DEBUG
#endif // Home

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int N = 100100;

struct edge{
    int b, c, p;  
};

vector < edge > adj[N];

main() {
#ifdef Home
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif // Home
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n, m;
    cin >> n >> m;
    for(int a, b, c, p; m --> 0;) {
        cin >> a >> b >> c >> p;
        adj[a].push_back({b, c, p});
        adj[b].push_back({a, c, p});
    }
    for(int i = 1; i <= n; ++i) {
        sort(adj[i].begin(), adj[i].end(), [&](edge a, edge b) {
                    return a.c < b.c;
                });
    }
    priority_queue < pair < int, int > > pq; 
    vector < ll > dist(n + 1, 1e18);
    dist[1] = 0;
    pq.push({0, 1});
    for(; !pq.empty();) {
        auto [dst, v] = pq.top();
        pq.pop();
        if(-dst > dist[v]) {
            continue;
        }
        for(int i = 0; i < adj[v].size(); ++ i) {
            int tmp = ((i && adj[v][i - 1].c == adj[v][i].c)||
                       (i + 1 < adj[v].size() && adj[v][i].c == adj[v][i + 1].c) ? adj[v][i].p : 0);
            int u = adj[v][i].b;
            if(dist[v] + tmp < dist[u]) {
                dist[u] = dist[v] + tmp;
                pq.push({-dist[u], u});
            }
        }
    }
    cout << (dist[n] == 1e18 ? -1 : dist[n]);
}

Compilation message (stderr)

Main.cpp:20:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   20 | main() {
      | ^~~~
Main.cpp: In function 'int main()':
Main.cpp:50:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         for(int i = 0; i < adj[v].size(); ++ i) {
      |                        ~~^~~~~~~~~~~~~~~
Main.cpp:52:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |                        (i + 1 < adj[v].size() && adj[v][i].c == adj[v][i + 1].c) ? adj[v][i].p : 0);
      |                         ~~~~~~^~~~~~~~~~~~~~~

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