oj.uz

Submission #873070

# Submission time Handle Problem Language Result Execution time Memory
873070 2023-11-14T11:54:14 Z HossamHero7 Naboj (COCI22_naboj) C++14
110 / 110
 207 ms 30904 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define endl '\n'
void solve(){
    int n,m;
    cin>>n>>m;
    vector<int> pos(n+1) , neg(n+1);
    vector<vector<pair<int,int>>> adj(n+1);
    for(int i=0;i<m;i++){
        int a,b;
        cin>>a>>b;
        adj[a].push_back({b,1});
        adj[b].push_back({a,0});
        pos[a] ++;
        neg[b] ++;
    }
    queue<int> q;
    vector<bool> vis(n+1);
    for(int i=1;i<=n;i++){
        if(pos[i] && neg[i]) continue;
        q.push(i);
        vis[i] = 1;
    }
    vector<pair<int,int>> ans;
    while(q.size()){
        int cur = q.front();        q.pop();
        bool curt = 0;
        if(pos[cur]) ans.push_back({cur,1}) , curt = 1;
        if(neg[cur]) ans.push_back({cur,0}) , curt = 0;
        pos[cur] = neg[cur] = 0;
        for(auto [ch,t] : adj[cur]){
            if(vis[ch]) continue;
            if(curt != t) return cout<<-1<<endl , void();
            if(t) neg[ch] --;
            else pos[ch] --;
            if(pos[ch] == 0 || neg[ch] == 0){
                q.push(ch);
                vis[ch] = 1;
            }
        }
    }
    for(int i=1;i<=n;i++){
        if(pos[i] || neg[i]) return cout<<-1<<endl, void();
    }
    reverse(ans.begin(),ans.end());
    cout<<ans.size()<<endl;
    for(auto [i,t] : ans) cout<<i<<' '<<t<<endl;
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);      cout.tie(0);
    int t=1;
    //cin>>t;
    while(t--){
        solve();
    }
    return 0;
}

Compilation message

naboj.cpp: In function 'void solve()':
naboj.cpp:32:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   32 |         for(auto [ch,t] : adj[cur]){
      |                  ^
naboj.cpp:48:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   48 |     for(auto [i,t] : ans) cout<<i<<' '<<t<<endl;
      |              ^

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 360 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 452 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 108 ms 20572 KB Output is correct
2 Correct 125 ms 20488 KB Output is correct
3 Correct 41 ms 10952 KB Output is correct
4 Correct 125 ms 20652 KB Output is correct
5 Correct 91 ms 20640 KB Output is correct
6 Correct 112 ms 20492 KB Output is correct
7 Correct 115 ms 20672 KB Output is correct
8 Correct 89 ms 16068 KB Output is correct
9 Correct 93 ms 20512 KB Output is correct
10 Correct 108 ms 20508 KB Output is correct

Subtask #3
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 360 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 452 KB Output is correct
15 Correct 108 ms 20572 KB Output is correct
16 Correct 125 ms 20488 KB Output is correct
17 Correct 41 ms 10952 KB Output is correct
18 Correct 125 ms 20652 KB Output is correct
19 Correct 91 ms 20640 KB Output is correct
20 Correct 112 ms 20492 KB Output is correct
21 Correct 115 ms 20672 KB Output is correct
22 Correct 89 ms 16068 KB Output is correct
23 Correct 93 ms 20512 KB Output is correct
24 Correct 108 ms 20508 KB Output is correct
25 Correct 111 ms 21288 KB Output is correct
26 Correct 112 ms 22736 KB Output is correct
27 Correct 153 ms 24264 KB Output is correct
28 Correct 178 ms 27700 KB Output is correct
29 Correct 125 ms 20840 KB Output is correct
30 Correct 157 ms 27296 KB Output is correct
31 Correct 18 ms 4184 KB Output is correct
32 Correct 106 ms 21080 KB Output is correct
33 Correct 207 ms 29656 KB Output is correct
34 Correct 124 ms 21704 KB Output is correct
35 Correct 189 ms 29648 KB Output is correct
36 Correct 140 ms 20864 KB Output is correct
37 Correct 172 ms 27904 KB Output is correct
38 Correct 136 ms 25288 KB Output is correct
39 Correct 190 ms 29392 KB Output is correct
40 Correct 204 ms 26720 KB Output is correct
41 Correct 152 ms 26600 KB Output is correct
42 Correct 191 ms 30656 KB Output is correct
43 Correct 148 ms 22624 KB Output is correct
44 Correct 202 ms 30904 KB Output is correct
45 Correct 130 ms 21676 KB Output is correct
46 Correct 154 ms 26868 KB Output is correct