Submission #8854

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
8854	2014-09-21 12:01:48	gs13068	Your life (kriii2_Y)	C++98	4 / 4	80 ms	9844 KiB

Y

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
#include<cstdio>
#include<vector>
std::vector<int> a[200001];
int d[200001];
int main()
{
  int n,m;
  int i,j,x,y;
    scanf("%d%d",&n,&m);
    for(i=1;i<=m;i++)
  {
    scanf("%d%d",&x,&y);
    a[x].push_back(y);
  }
  for(i=1;i<=n;i++)d[i]=2e9;
    d[1]=0;
  for(i=1;i<=n;i++)for(j=0;j<a[i].size();j++)if(d[a[i][j]]>d[i]+1)d[a[i][j]]=d[i]+1;
  printf("%d",d[n]<1e9?d[n]:-1);
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

• Subtask 1: 1 / 1
• Subtask 2: 3 / 3