제출 #782581

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
782581		devariaota	Naboj (COCI22_naboj)	C++17	110 / 110	657 ms	24116 KiB

naboj

#include<bits/stdc++.h>
using namespace std;
#define ioss ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define pii pair<int, int>
#define fi first
#define se second
#define pb push_back
int n, m;
vector<int> adj[200004];
bool vis[200004];
int cnt[200004];
queue<int> st;



void toposort(int u) {
    if(vis[u]) return;


    vis[u] = 1;


    st.push(u);

    // cout << "::" << u << endl;

    for(auto v : adj[u]) {
        // cout << v << endl;
        cnt[v]--;
    }

    for(auto v : adj[u]) {
        if(!vis[v] && cnt[v] == 0) toposort(v);
    }

    // cout << u << endl;
}
int main() {
    ioss;
    cin >> n >> m;
    set<int> tmp;
    for(int i = 0; i < m; i++) {
        int a, b; cin >> a >> b;
        tmp.insert(a);
        adj[b].pb(a);
        cnt[a]++;
    }

    for(int i = 1; i <= n; i++) {
        if(!vis[i] && cnt[i] == 0) toposort(i);
        // cout << cnt[i] << endl;
    }
    bool ok = 1;
    for(int i = 1; i <= n; i++) {
        if(!vis[i]) {
            ok = 0;
            break;
        }
    }
    if(!ok) {
        cout << -1 << endl;
        return 0;
    }
    cout << st.size() << endl;
    while(!st.empty()) {
        int u = st.front();
        st.pop();
        if(tmp.count(u)) cout << u << " " << 1 << endl;
        else cout << u << " " << 0 << endl;
    }
}

• Subtask 1: 15 / 15
• Subtask 2: 25 / 25
• Subtask 3: 70 / 70