Submission #1124682

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124682		HasanV11010238	Naboj (COCI22_naboj)	C++20	110 / 110	931 ms	73520 KiB

naboj

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define MAX 1000000
#define mod 998244353
set<int> s;
vector<set<int>> v, vr;
void check(int x){
    if ((v[x].size() + vr[x].size()) == 0) return;
    if (v[x].size() == 0) s.insert(x);
    if (vr[x].size() == 0) s.insert(x);
}
int main(){
    int n, m, a, b;
    cin>>n>>m;
    v.assign(n + 1, set<int>()), vr.assign(n + 1, set<int>());
    for (int i = 0; i < m; i++){
        cin>>a>>b;
        v[b].insert(a);
        vr[a].insert(b);
    }
    for (int i = 1; i <= n; i++){
        check(i);
    }
    vector<vector<int>> ord;
    while (!s.empty()){
        int x = *s.begin();
        s.erase(s.begin());
        if ((v[x].size() + vr[x].size()) == 0) continue;
        if (v[x].size() == 0){
            ord.push_back({x, 1});
            for (auto el : vr[x]){
                v[el].erase(x);
                check(el);
            }
            vr[x].clear();
        }
        else{
            ord.push_back({x, 0});
            for (auto el : v[x]){
                vr[el].erase(x);
                check(el);
            }
            v[x].clear();
        }
    }
    bool can = 1;
    for (int i = 1; i <= n; i++){
        if (v[i].size() != 0 || vr[i].size() != 0){
            can = 0;
        }
    }
    if (can){
        reverse(ord.begin(), ord.end());
        cout<<ord.size()<<"\n";
        for (auto el : ord){
            cout<<el[0]<<" "<<el[1]<<"\n";
        }
    }
    else{
        cout<<-1;
    }
}

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