Submission #619890

#	Time	Username	Problem	Language	Result	Execution time	Memory
619890		sokratisi	Stations (IOI20_stations)	C++17	5 / 100	903 ms	744 KiB

stations

#include "stations.h"
#include <vector>

using namespace std;

int cur = 0;

void dfs(int s, vector<bool>& vis, const vector<vector<int>>& adj, vector<int>& labels) {
    labels[s] = cur++;
    vis[s] = true;
    for (auto u: adj[s]) {
        if (!vis[u]) {
            dfs(u, vis, adj, labels);
        }
    }
}


vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    cur = 0;
	vector<vector<int>> adj(n);
    for (int i = 0; i < u.size(); i++) {
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }
    int s;
    for (int i = 0; i < n; i++) if(adj[i].size() == 1) s = i;
    vector<int> labels(n);
    vector<bool> vis(n, false);
    dfs(s, vis, adj, labels);
    return labels;
}

int find_next_station(int s, int t, vector<int> c) {
    if (c.size() == 1) return c[0];
    if (s < t) return max(c[0], c[1]);
    return min(c[0], c[1]);
}

// int main() {
//     int n, k;
//     scanf("%d%d", &n, &k);

//     vector<int> u(n-1);
//     vector<int> v(n-1);
//     for (int i = 0; i < n - 1; i++) {
//         scanf("%d%d", &u[i], &v[i]);
//     }

//     label(n, k, u, v);

//     return 0;
// }

Compilation message (stderr)

stations.cpp: In function 'std::vector<int> label(int, int, std::vector<int>, std::vector<int>)':
stations.cpp:22:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for (int i = 0; i < u.size(); i++) {
      |                     ~~^~~~~~~~~~
stations.cpp:30:8: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
   30 |     dfs(s, vis, adj, labels);
      |     ~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 0 / 10
• Subtask 5: 0 / 61