Submission #704973

#	Time	Username	Problem	Language	Result	Execution time	Memory
704973		PikaQ	Naboj (COCI22_naboj)	C++17	110 / 110	910 ms	21780 KiB

naboj

#include<bits/stdc++.h>
#define int long long
#define forn(i,n) for(int i = 0;i < n;i++)
#define Forn(i,n) for(int i = 1;i <= n;i++)
#define vi vector<int>
#define pb push_back
#define pii pair<int,int>
#define all(p) p.begin(),p.end()
#define F first
#define S second
using namespace std;
void debug() {cerr << endl;}
template <class T, class ...U> void debug(T a, U ... b) { cerr << a << " "; debug(b...);}
const int INF = 1e13 + 10;
const int MOD = (int) 998244353;
const int N = 2e5 + 9;
int n,m;
vi e[N];

int in[N];
vi ord;
bool tag[N],vis[N];

void dfs(int u){
	debug(u);
	vis[u] = 1,tag[u] = 1;
	for(int c : e[u]){
		if(tag[c]){
			cout << "-1\n";
			exit(0);
		}
		if(!vis[c]){
			dfs(c);
		}
	}
	tag[u] = 0;
	ord.pb(u);
}
bool st[N];

void solve(){
	//pancake ( ^-^)_	
	cin >> n >> m;
	forn(i,m){
		int s,t;
		cin >> s >> t;
		e[s].pb(t);
		in[t]++;
	}
	
	Forn(i,n){
		if(!vis[i] && in[i] == 0) dfs(i),st[i] = 1;
	}
	if(ord.size() != n) {
		cout << "-1\n";
		return;
	}
	cout << ord.size() << '\n';
	reverse(all(ord));
	for(auto &i : ord) {
		if(st[i]) cout << i << ' ' << 1 << '\n';
		else cout << i << ' ' << 0 << '\n';
	}
}

signed main(){
	cin.tie(NULL);
	cout.tie(NULL);
	ios_base::sync_with_stdio(0);
	solve();
	return 0;
}







	

Compilation message (stderr)

naboj.cpp: In function 'void solve()':
naboj.cpp:54:16: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   54 |  if(ord.size() != n) {
      |     ~~~~~~~~~~~^~~~

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