Submission #104667

#	Time	Username	Problem	Language	Result	Execution time	Memory
104667		leonarda	Wand (COCI19_wand)	C++14	70 / 70	75 ms	4860 KiB

wand

#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define F first
#define S second
typedef pair<int, int> pi;
typedef long long int lint;
const int inf = 0x3f3f3f3f;
const int maxn = 1e5 + 5;

int n, m, out1;
vector<int> v[maxn];
bool moze[maxn];
bool memo[maxn];

void solve(int x) {
	if(v[x].empty() or memo[x]) return;
	memo[x] = 1;
	for(int i = 0; i < v[x].size(); ++i) {
		moze[v[x][i]] = 1;
		solve(v[x][i]);
	}
	return;
}

int main ()
{
	ios::sync_with_stdio(0);
	
	cin >> n >> m;
	for(int i = 0; i < m; ++i) {
		int x, y;
		cin >> x >> y;
		if(y == 1) ++out1;
		v[y - 1].pb(x - 1);
	}
	
	if(out1 == 0) {
		cout << 1;
		for(int i = 1; i < n; ++i)
			cout << 0;
		return 0;
	}
	
	solve(0);
	
	for(int i = 0; i < n; ++i)
		cout << moze[i];

return 0;
}
//written and directed by pcelicamaja

Compilation message (stderr)

wand.cpp: In function 'void solve(int)':
wand.cpp:20:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < v[x].size(); ++i) {
                 ~~^~~~~~~~~~~~~

• Subtask 1: 70 / 70