oj.uz

Submission #782444

# Submission time Handle Problem Language Result Execution time Memory
782444 2023-07-14T01:46:36 Z christinelynn Naboj (COCI22_naboj) C++17
110 / 110
 306 ms 19564 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 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4964 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 2 ms 4948 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 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 192 ms 15784 KB Output is correct
2 Correct 202 ms 15784 KB Output is correct
3 Correct 110 ms 10696 KB Output is correct
4 Correct 196 ms 15808 KB Output is correct
5 Correct 195 ms 15744 KB Output is correct
6 Correct 199 ms 15808 KB Output is correct
7 Correct 191 ms 15780 KB Output is correct
8 Correct 156 ms 12708 KB Output is correct
9 Correct 193 ms 15800 KB Output is correct
10 Correct 199 ms 15812 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 2 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 2 ms 4964 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 2 ms 4948 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 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 192 ms 15784 KB Output is correct
16 Correct 202 ms 15784 KB Output is correct
17 Correct 110 ms 10696 KB Output is correct
18 Correct 196 ms 15808 KB Output is correct
19 Correct 195 ms 15744 KB Output is correct
20 Correct 199 ms 15808 KB Output is correct
21 Correct 191 ms 15780 KB Output is correct
22 Correct 156 ms 12708 KB Output is correct
23 Correct 193 ms 15800 KB Output is correct
24 Correct 199 ms 15812 KB Output is correct
25 Correct 97 ms 12704 KB Output is correct
26 Correct 82 ms 13700 KB Output is correct
27 Correct 119 ms 13984 KB Output is correct
28 Correct 106 ms 14928 KB Output is correct
29 Correct 62 ms 14168 KB Output is correct
30 Correct 138 ms 14824 KB Output is correct
31 Correct 22 ms 6572 KB Output is correct
32 Correct 183 ms 16360 KB Output is correct
33 Correct 283 ms 19136 KB Output is correct
34 Correct 208 ms 16460 KB Output is correct
35 Correct 306 ms 19184 KB Output is correct
36 Correct 170 ms 16304 KB Output is correct
37 Correct 265 ms 18684 KB Output is correct
38 Correct 226 ms 18160 KB Output is correct
39 Correct 273 ms 19028 KB Output is correct
40 Correct 289 ms 18476 KB Output is correct
41 Correct 274 ms 18384 KB Output is correct
42 Correct 281 ms 19392 KB Output is correct
43 Correct 212 ms 16616 KB Output is correct
44 Correct 288 ms 19564 KB Output is correct
45 Correct 216 ms 16396 KB Output is correct
46 Correct 248 ms 18376 KB Output is correct