oj.uz

Submission #782005

# Submission time Handle Problem Language Result Execution time Memory
782005 2023-07-13T14:42:09 Z Owen11 Naboj (COCI22_naboj) C++14
110 / 110
 376 ms 20584 KB 
#include <bits/stdc++.h>
using namespace std;

# define int long long
# define fir first
# define sec second
# define pb push_back

const int cnst = 2e5+5;
bool mutipletestcase = 0;
//bool debug = false;

int x[cnst];
vector<int> vec[cnst];

void solve() {
    int n, m; cin >> n >> m;

    for(int i = 1; i<=m; i++) {
        int a, b; cin >> a >> b;
        vec[b].pb(a);
        x[a]++;
    }

    queue<int> q;
    int done = 0;

    for(int i = 1; i<=n; i++) {
        if(!x[i]) q.push(i), done++;
    }

    vector<pair<int, int>> ans;

    while(!q.empty()) {
        int a = q.front(); q.pop();

        for(auto v: vec[a]) {
            x[v]--;
            if(!x[v]) {
                q.push(v);
                ans.pb({v, 1});
                done++;
            }
        }
        if(done == n) break;
    }

    if(done == n) {
        cout << ans.size() << endl;
        for(auto v: ans) cout << v.fir << " " << v.sec << endl;
    }
    else cout << -1 << endl;
}

signed main() {
    ios_base::sync_with_stdio(false);
    int t = 1;
    if(mutipletestcase) cin >> t; 
    while(t--) solve();
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4964 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 5024 KB Output is correct
8 Correct 2 ms 5028 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 2 ms 5024 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 206 ms 16888 KB Output is correct
2 Correct 197 ms 16888 KB Output is correct
3 Correct 133 ms 11312 KB Output is correct
4 Correct 204 ms 17040 KB Output is correct
5 Correct 235 ms 16944 KB Output is correct
6 Correct 202 ms 16960 KB Output is correct
7 Correct 207 ms 16968 KB Output is correct
8 Correct 152 ms 13828 KB Output is correct
9 Correct 207 ms 16904 KB Output is correct
10 Correct 201 ms 16864 KB Output is correct

Subtask #3
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4964 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 4948 KB Output is correct
7 Correct 3 ms 5024 KB Output is correct
8 Correct 2 ms 5028 KB Output is correct
9 Correct 2 ms 4948 KB Output is correct
10 Correct 2 ms 4948 KB Output is correct
11 Correct 2 ms 5024 KB Output is correct
12 Correct 2 ms 4948 KB Output is correct
13 Correct 2 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 206 ms 16888 KB Output is correct
16 Correct 197 ms 16888 KB Output is correct
17 Correct 133 ms 11312 KB Output is correct
18 Correct 204 ms 17040 KB Output is correct
19 Correct 235 ms 16944 KB Output is correct
20 Correct 202 ms 16960 KB Output is correct
21 Correct 207 ms 16968 KB Output is correct
22 Correct 152 ms 13828 KB Output is correct
23 Correct 207 ms 16904 KB Output is correct
24 Correct 201 ms 16864 KB Output is correct
25 Correct 130 ms 13736 KB Output is correct
26 Correct 94 ms 14708 KB Output is correct
27 Correct 108 ms 14968 KB Output is correct
28 Correct 117 ms 15976 KB Output is correct
29 Correct 72 ms 15236 KB Output is correct
30 Correct 150 ms 15820 KB Output is correct
31 Correct 19 ms 6940 KB Output is correct
32 Correct 190 ms 17324 KB Output is correct
33 Correct 299 ms 20184 KB Output is correct
34 Correct 220 ms 17408 KB Output is correct
35 Correct 308 ms 20156 KB Output is correct
36 Correct 209 ms 17272 KB Output is correct
37 Correct 268 ms 19700 KB Output is correct
38 Correct 256 ms 19344 KB Output is correct
39 Correct 295 ms 20108 KB Output is correct
40 Correct 276 ms 19492 KB Output is correct
41 Correct 277 ms 19356 KB Output is correct
42 Correct 319 ms 20432 KB Output is correct
43 Correct 198 ms 17672 KB Output is correct
44 Correct 376 ms 20584 KB Output is correct
45 Correct 196 ms 17436 KB Output is correct
46 Correct 295 ms 19504 KB Output is correct