Submission #9159

#	Time	Username	Problem	Language	Result	Execution time	Memory
9159		pichulia	Your life (kriii2_Y)	C++98	4 / 4	88 ms	11404 KiB

Y

#include<stdio.h>
#include<algorithm>
#include<vector>
using namespace std;
typedef pair<int, int> pii;
int n,m;
int d[200000];
int queue[200000];
int q,r;
vector<int> v[200000];
int mark[200000];
int main()
{
	scanf("%d %d",&n,&m);
	int i, j, k;
	for(i=0;i<n;i++)
		d[i] = 1000000000;
	queue[0] = 0;
	q=0;r=1;
	while(m--)
	{
		scanf("%d %d",&i,&j);
		i--;j--;
		v[i].push_back(j);
	}
	d[0] = 0;
	while(q<r)
	{
		int qi = queue[q];
		for(i=0;i<v[qi].size();i++)
		{
			j = v[qi][i];
			if(d[j] > d[qi]+1)
			{
				d[j] = d[qi]+1;
				queue[r] = j;
				r++;
			}
		}
		q++;
	}
	if(d[n-1] > 999999999)d[n-1] = -1;
	printf("%d\n",d[n-1]);
}

• Subtask 1: 1 / 1
• Subtask 2: 3 / 3