oj.uz

Submission #575877

# Submission time Handle Problem Language Result Execution time Memory
575877 2022-06-11T12:47:58 Z eecs Naboj (COCI22_naboj) C++17
110 / 110
 799 ms 61048 KB 
#include <bits/stdc++.h>
using namespace std;

const int maxn = 200010;
int n, m, c0[maxn], c1[maxn];
bool vis[maxn];
set<pair<int, int>> G[maxn];
vector<array<int, 2>> res;

int main() {
    ios::sync_with_stdio(0), cin.tie(0);
    cin >> n >> m;
    while (m--) {
        int u, v;
        cin >> u >> v;
        G[u].emplace(v, 1), G[v].emplace(u, 0);
        c0[u]++, c1[v]++;
    }
    queue<int> Q;
    for (int i = 1; i <= n; i++) {
        if (!c0[i] || !c1[i]) Q.push(i);
    }
    while (!Q.empty()) {
        int x = Q.front(); Q.pop();
        if (vis[x]) continue;
        res.push_back({x, c0[x] ? 1 : 0}), vis[x] = 1;
        for (auto &e : G[x]) if (!vis[e.first]) {
            (e.second ? c1[e.first] : c0[e.first])--;
            G[e.first].erase({x, !e.second});
            if (!c0[e.first] || !c1[e.first]) Q.push(e.first);
        }
    }
    if (count(vis + 1, vis + n + 1, 0)) cout << "-1\n", exit(0);
    cout << res.size() << "\n";
    reverse(res.begin(), res.end());
    for (auto &p : res) {
        cout << p[0] << " " << p[1] << "\n";
    }
    return 0;
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 9684 KB Output is correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 5 ms 9652 KB Output is correct
4 Correct 5 ms 9684 KB Output is correct
5 Correct 5 ms 9684 KB Output is correct
6 Correct 5 ms 9684 KB Output is correct
7 Correct 4 ms 9684 KB Output is correct
8 Correct 5 ms 9684 KB Output is correct
9 Correct 4 ms 9684 KB Output is correct
10 Correct 6 ms 9700 KB Output is correct
11 Correct 5 ms 9732 KB Output is correct
12 Correct 5 ms 9684 KB Output is correct
13 Correct 5 ms 9700 KB Output is correct
14 Correct 5 ms 9684 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 277 ms 34208 KB Output is correct
2 Correct 263 ms 34204 KB Output is correct
3 Correct 121 ms 22704 KB Output is correct
4 Correct 264 ms 34232 KB Output is correct
5 Correct 262 ms 34216 KB Output is correct
6 Correct 273 ms 34400 KB Output is correct
7 Correct 266 ms 34328 KB Output is correct
8 Correct 200 ms 28984 KB Output is correct
9 Correct 270 ms 34340 KB Output is correct
10 Correct 264 ms 34376 KB Output is correct

Subtask #3
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 9684 KB Output is correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 5 ms 9652 KB Output is correct
4 Correct 5 ms 9684 KB Output is correct
5 Correct 5 ms 9684 KB Output is correct
6 Correct 5 ms 9684 KB Output is correct
7 Correct 4 ms 9684 KB Output is correct
8 Correct 5 ms 9684 KB Output is correct
9 Correct 4 ms 9684 KB Output is correct
10 Correct 6 ms 9700 KB Output is correct
11 Correct 5 ms 9732 KB Output is correct
12 Correct 5 ms 9684 KB Output is correct
13 Correct 5 ms 9700 KB Output is correct
14 Correct 5 ms 9684 KB Output is correct
15 Correct 277 ms 34208 KB Output is correct
16 Correct 263 ms 34204 KB Output is correct
17 Correct 121 ms 22704 KB Output is correct
18 Correct 264 ms 34232 KB Output is correct
19 Correct 262 ms 34216 KB Output is correct
20 Correct 273 ms 34400 KB Output is correct
21 Correct 266 ms 34328 KB Output is correct
22 Correct 200 ms 28984 KB Output is correct
23 Correct 270 ms 34340 KB Output is correct
24 Correct 264 ms 34376 KB Output is correct
25 Correct 477 ms 49612 KB Output is correct
26 Correct 398 ms 42132 KB Output is correct
27 Correct 469 ms 47688 KB Output is correct
28 Correct 574 ms 56924 KB Output is correct
29 Correct 315 ms 37184 KB Output is correct
30 Correct 572 ms 56072 KB Output is correct
31 Correct 67 ms 17860 KB Output is correct
32 Correct 308 ms 36536 KB Output is correct
33 Correct 721 ms 57504 KB Output is correct
34 Correct 344 ms 38336 KB Output is correct
35 Correct 726 ms 57928 KB Output is correct
36 Correct 302 ms 35856 KB Output is correct
37 Correct 634 ms 53320 KB Output is correct
38 Correct 508 ms 47380 KB Output is correct
39 Correct 707 ms 57012 KB Output is correct
40 Correct 574 ms 50748 KB Output is correct
41 Correct 566 ms 50228 KB Output is correct
42 Correct 772 ms 60084 KB Output is correct
43 Correct 386 ms 40520 KB Output is correct
44 Correct 799 ms 61048 KB Output is correct
45 Correct 342 ms 38208 KB Output is correct
46 Correct 577 ms 50720 KB Output is correct