oj.uz

Submission #936042

# Submission time Handle Problem Language Result Execution time Memory
936042 2024-03-01T03:44:28 Z Regulus Naboj (COCI22_naboj) C++17
110 / 110
 134 ms 24776 KB 
#include <bits/stdc++.h>
#define IO ios::sync_with_stdio(false);cin.tie(0);
#define debug(x) cerr << #x << " = " << (x) << ' '
#define bug(x) cerr << (x) << ' '
#define endl cerr << '\n'
#define all(v) (v).begin(), (v).end()
#define SZ(v) (ll)(v).size()
#define lowbit(x) (x)&-(x)
#define pb emplace_back
#define F first
#define S second
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
//#define TEST
const int N = 2e5+5;
int in[N];
vector<int> g[N];
vector<pll> ans;
queue<int> Q;

int main(void)
{ IO
    int n, i, m;

    cin >> n >> m;
    for (i=0; i < m; ++i)
    {
        int x, y; cin >> y >> x;
        g[x].pb(y), ++in[y];
    }

    int cnt = n;
    for (i=1; i <= n; ++i)
    {
        if (!in[i]) Q.push(i);
    }
    while (!Q.empty())
    {
        int x = Q.front(); Q.pop();
        --cnt;
        ans.pb(x, 0);
        for (int v : g[x])
        {
            --in[v];
            if (!in[v]) Q.push(v);
        }
    }

    if (cnt > 0) cout << "-1\n";
    else {
        cout << SZ(ans) << '\n';
        reverse(all(ans));
        for (auto p : ans) cout << p.F << ' ' << p.S << '\n';
    }

    return 0;
}

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4956 KB Output is correct
2 Correct 2 ms 5160 KB Output is correct
3 Correct 1 ms 5164 KB Output is correct
4 Correct 1 ms 4956 KB Output is correct
5 Correct 1 ms 4956 KB Output is correct
6 Correct 1 ms 4956 KB Output is correct
7 Correct 1 ms 5112 KB Output is correct
8 Correct 1 ms 5160 KB Output is correct
9 Correct 2 ms 5208 KB Output is correct
10 Correct 1 ms 4956 KB Output is correct
11 Correct 1 ms 4956 KB Output is correct
12 Correct 2 ms 4956 KB Output is correct
13 Correct 2 ms 4956 KB Output is correct
14 Correct 1 ms 4956 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 77 ms 16004 KB Output is correct
2 Correct 68 ms 16068 KB Output is correct
3 Correct 35 ms 10440 KB Output is correct
4 Correct 68 ms 16476 KB Output is correct
5 Correct 72 ms 16332 KB Output is correct
6 Correct 69 ms 15224 KB Output is correct
7 Correct 67 ms 15820 KB Output is correct
8 Correct 70 ms 14192 KB Output is correct
9 Correct 67 ms 15304 KB Output is correct
10 Correct 90 ms 16376 KB Output is correct

Subtask #3
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4956 KB Output is correct
2 Correct 2 ms 5160 KB Output is correct
3 Correct 1 ms 5164 KB Output is correct
4 Correct 1 ms 4956 KB Output is correct
5 Correct 1 ms 4956 KB Output is correct
6 Correct 1 ms 4956 KB Output is correct
7 Correct 1 ms 5112 KB Output is correct
8 Correct 1 ms 5160 KB Output is correct
9 Correct 2 ms 5208 KB Output is correct
10 Correct 1 ms 4956 KB Output is correct
11 Correct 1 ms 4956 KB Output is correct
12 Correct 2 ms 4956 KB Output is correct
13 Correct 2 ms 4956 KB Output is correct
14 Correct 1 ms 4956 KB Output is correct
15 Correct 77 ms 16004 KB Output is correct
16 Correct 68 ms 16068 KB Output is correct
17 Correct 35 ms 10440 KB Output is correct
18 Correct 68 ms 16476 KB Output is correct
19 Correct 72 ms 16332 KB Output is correct
20 Correct 69 ms 15224 KB Output is correct
21 Correct 67 ms 15820 KB Output is correct
22 Correct 70 ms 14192 KB Output is correct
23 Correct 67 ms 15304 KB Output is correct
24 Correct 90 ms 16376 KB Output is correct
25 Correct 87 ms 15180 KB Output is correct
26 Correct 67 ms 16920 KB Output is correct
27 Correct 79 ms 17356 KB Output is correct
28 Correct 92 ms 18456 KB Output is correct
29 Correct 58 ms 19932 KB Output is correct
30 Correct 89 ms 18392 KB Output is correct
31 Correct 15 ms 7004 KB Output is correct
32 Correct 78 ms 21448 KB Output is correct
33 Correct 119 ms 24004 KB Output is correct
34 Correct 81 ms 20680 KB Output is correct
35 Correct 126 ms 23288 KB Output is correct
36 Correct 76 ms 20932 KB Output is correct
37 Correct 123 ms 23500 KB Output is correct
38 Correct 120 ms 22772 KB Output is correct
39 Correct 118 ms 23092 KB Output is correct
40 Correct 111 ms 23240 KB Output is correct
41 Correct 111 ms 22104 KB Output is correct
42 Correct 134 ms 24776 KB Output is correct
43 Correct 98 ms 22136 KB Output is correct
44 Correct 131 ms 24256 KB Output is correct
45 Correct 79 ms 20424 KB Output is correct
46 Correct 115 ms 22728 KB Output is correct