oj.uz

Submission #782195

# Submission time Handle Problem Language Result Execution time Memory
782195 2023-07-13T16:15:04 Z devariaota Naboj (COCI22_naboj) C++17
110 / 110
 519 ms 40088 KB 
#include<bits/stdc++.h>
 
#define sherina ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define pb push_back
#define int long long
#define INF 1e18

using namespace std;

int n , m , a[500005] , b[500005] , jmlhbapa[500005];
vector < int > adj[500005];
vector < pair < int , int > > ans;

void dfs(){
   queue < int > q;
   for(int i = 1 ; i <= n ; i++){
      if(jmlhbapa[i] == 0){
         q.push(i);
         ans.pb(make_pair(i , 0));
      }
   }
   while(!q.empty()){
      int u = q.front(); q.pop();
      //cout << u << endl;
      for(int i : adj[u]){
         jmlhbapa[i]--;
         if(jmlhbapa[i] == 0){
            ans.pb(make_pair(i , 0));
            q.push(i);
         }
      }
   }
}

signed main(){
   cin >> n >> m;
   for(int i = 1 ; i <= m ; i++){
      cin >> a[i] >> b[i];
      adj[a[i]].pb(b[i]);
      jmlhbapa[b[i]]++;
   }
   dfs();
   bool bs = true;
   for(int i = 1 ; i <= n ; i++){
      if(jmlhbapa[i] > 0) bs = false;
   }
   if(!bs){
      cout << "-1" << endl;
      return 0;
   }
   cout << ans.size() << endl;
   for(int i = 0 ; i < ans.size() ; i++){
      cout << ans[i].first << " " << ans[i].second << endl;
   }
}

Compilation message

naboj.cpp: In function 'int main()':
naboj.cpp:52:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |    for(int i = 0 ; i < ans.size() ; i++){
      |                    ~~^~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12048 KB Output is correct
2 Correct 7 ms 12044 KB Output is correct
3 Correct 6 ms 12052 KB Output is correct
4 Correct 6 ms 11988 KB Output is correct
5 Correct 6 ms 12052 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 6 ms 11976 KB Output is correct
8 Correct 6 ms 12056 KB Output is correct
9 Correct 6 ms 12048 KB Output is correct
10 Correct 6 ms 12056 KB Output is correct
11 Correct 6 ms 12048 KB Output is correct
12 Correct 6 ms 12052 KB Output is correct
13 Correct 6 ms 12056 KB Output is correct
14 Correct 5 ms 11988 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 341 ms 29144 KB Output is correct
2 Correct 333 ms 29052 KB Output is correct
3 Correct 171 ms 20828 KB Output is correct
4 Correct 336 ms 29028 KB Output is correct
5 Correct 335 ms 29064 KB Output is correct
6 Correct 354 ms 29108 KB Output is correct
7 Correct 348 ms 29012 KB Output is correct
8 Correct 275 ms 25836 KB Output is correct
9 Correct 336 ms 29120 KB Output is correct
10 Correct 354 ms 29004 KB Output is correct

Subtask #3
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 12048 KB Output is correct
2 Correct 7 ms 12044 KB Output is correct
3 Correct 6 ms 12052 KB Output is correct
4 Correct 6 ms 11988 KB Output is correct
5 Correct 6 ms 12052 KB Output is correct
6 Correct 6 ms 11988 KB Output is correct
7 Correct 6 ms 11976 KB Output is correct
8 Correct 6 ms 12056 KB Output is correct
9 Correct 6 ms 12048 KB Output is correct
10 Correct 6 ms 12056 KB Output is correct
11 Correct 6 ms 12048 KB Output is correct
12 Correct 6 ms 12052 KB Output is correct
13 Correct 6 ms 12056 KB Output is correct
14 Correct 5 ms 11988 KB Output is correct
15 Correct 341 ms 29144 KB Output is correct
16 Correct 333 ms 29052 KB Output is correct
17 Correct 171 ms 20828 KB Output is correct
18 Correct 336 ms 29028 KB Output is correct
19 Correct 335 ms 29064 KB Output is correct
20 Correct 354 ms 29108 KB Output is correct
21 Correct 348 ms 29012 KB Output is correct
22 Correct 275 ms 25836 KB Output is correct
23 Correct 336 ms 29120 KB Output is correct
24 Correct 354 ms 29004 KB Output is correct
25 Correct 212 ms 31132 KB Output is correct
26 Correct 189 ms 30068 KB Output is correct
27 Correct 216 ms 31868 KB Output is correct
28 Correct 316 ms 35600 KB Output is correct
29 Correct 147 ms 30120 KB Output is correct
30 Correct 282 ms 35212 KB Output is correct
31 Correct 42 ms 15640 KB Output is correct
32 Correct 344 ms 29100 KB Output is correct
33 Correct 476 ms 38452 KB Output is correct
34 Correct 363 ms 30076 KB Output is correct
35 Correct 466 ms 38720 KB Output is correct
36 Correct 342 ms 28792 KB Output is correct
37 Correct 479 ms 36552 KB Output is correct
38 Correct 414 ms 33748 KB Output is correct
39 Correct 519 ms 38220 KB Output is correct
40 Correct 452 ms 35408 KB Output is correct
41 Correct 446 ms 35240 KB Output is correct
42 Correct 493 ms 39684 KB Output is correct
43 Correct 363 ms 30916 KB Output is correct
44 Correct 482 ms 40088 KB Output is correct
45 Correct 366 ms 29840 KB Output is correct
46 Correct 445 ms 35380 KB Output is correct