Submission #100354

#	Time	Username	Problem	Language	Result	Execution time	Memory
100354		MatesV13	Wand (COCI19_wand)	C++11	70 / 70	64 ms	4856 KiB

wand

#include <bits/stdc++.h>
using namespace std;
int n, m, a, b;
vector<int> w[100005];
bool v[100005];
void dfs(int x){
	for (vector<int>::iterator it=w[x].begin();it!=w[x].end();it++){
		if (!v[*it]){v[*it] = true; dfs(*it);}
	}
	return;
}
int main (){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
bool am1=0;
	cin >> n >> m;
	for (int i=0;i<m;i++){
		cin >> a >> b;
		if (b==1) am1=1;
		w[b].push_back(a);
	}
	if(am1) dfs(1);
	else v[1]=1;
	for (int i=1;i<=n;i++) cout << v[i];
return 0;
}

• Subtask 1: 70 / 70