Submission #805605

#	Time	Username	Problem	Language	Result	Execution time	Memory
805605		raysh07	Keys (IOI21_keys)	C++17	Compilation error	0 ms	0 KiB

keys

#include <bits/stdc++.h>
using namespace std;
#define INF (int)1e9

int n, m;
const int N = 3e5 + 69;
vector <int> adj[N], pend[N];
bool have[N], vis[N]; //do i have this colour? 
int cnt[N], a[N], b[N];

vector<int> find_reachable(vector<int> r, vector<int> u, vector<int> v, vector<int> c) {
    n = r.size();
    m = u.size();
    
    for (int i = 0; i < m; i++){
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }
    
    for (int i = 0; i < n; i++){
        a[i] = r[i];
        b[i] = c[i];
    }
    
    int mn = INF;
    
    for (int i = 0; i < n; i++){
        for (int j = 0; j < n; j++){
            have[j] = false;
            pend[j].clear();
        }
        
        queue <int> q;
        q.push(i);
        
        while (!q.empty()){
            cnt[i]++;
            int u = q.front();
            q.pop();
            
            have[r[u]] = true;
            for (auto x : pend[r[u]]){
                vis[x] = true;
                q.push(x);
            }
            pend[r[u]].clear();
            
            for (int v : adj[u]){
                if (vis[v]) continue;
                if (have[c[v]]){
                    vis[v] = true;
                    q.push(v);
                } else {
                    pend[c[v]].push_back(v);
                }
            }
        }
        
        mn = min(mn, cnt[i]);
    }
    
    int ans = 0;
    for (int i = 0; i < n; i++){
        if (mn == cnt[i]) ans++;
    }
    
    return ans;
}

Compilation message (stderr)

keys.cpp: In function 'std::vector<int> find_reachable(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
keys.cpp:67:12: error: could not convert 'ans' from 'int' to 'std::vector<int>'
   67 |     return ans;
      |            ^~~
      |            |
      |            int