Submission #9151

#	Time	Username	Problem	Language	Result	Execution time	Memory
9151		maniac	Your life (kriii2_Y)	C++98	4 / 4	84 ms	7712 KiB

Y

#include<cstdio>
#include<cassert>
#include<cstring>
#include<map>
#include<set>
#include<time.h>
#include<algorithm>
#include<stack>
#include<queue>
#include<utility>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<limits>
   
using namespace std;

long long gcd( long long b, long long s ){
	return (s!=0) ? gcd( s, b%s ) : b;
}

const int N = 100005;
const int INF = 1000000007;
vector <int> e[N];
int d[N];

int main(){
	
	
	int n, m;
	scanf("%d %d", &n, &m);

	for(int i=0; i<m; i++){
		int x, y;
		scanf("%d %d", &x, &y);
		e[x].push_back( y );
	}

	queue <int> q;

	for(int i=1; i<=n; i++)
		d[i] = INF;
	q.push( 1 );
	d[1] = 0;
	while( !q.empty() ){
		int p = q.front(); q.pop();

		for(int i=0; i<e[p].size(); i++){
			int u = e[p][i];
			if( d[p]+1 < d[u] ){
				d[u] = d[p] + 1;
				q.push( u );
			}
		}
	}
		

	if( d[n] != INF )
		printf("%d\n", d[n]);
	else
		puts("-1");

}

• Subtask 1: 1 / 1
• Subtask 2: 3 / 3