Submission #8390

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
8390	2014-09-13 16:22:22	ainta	Your life (kriii2_Y)	C++98	4 / 4	68 ms	3432 KiB

Y

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#pragma warning(disable:4996)
#include<stdio.h>
#include<algorithm>
using namespace std;
struct point{
  int a, b;
  bool operator <(const point &p)const{
    return b < p.b;
  }
}w[200010];
int n, m, D[200010];
int main()
{
  int i;
  scanf("%d%d", &n, &m);
  for (i = 0; i < m; i++){
    scanf("%d%d", &w[i].a, &w[i].b);
  }
  sort(w, w + m);
  for (i = 2; i <= n; i++)D[i] = -1;
  for (i = 0; i < m; i++){
    if (D[w[i].a] != -1){
      if (D[w[i].b] == -1 || D[w[i].b] > D[w[i].a] + 1)D[w[i].b] = D[w[i].a] + 1;
    }
  }
  printf("%d\n", D[n]);
}
 
 
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• Subtask 1: 1 / 1
• Subtask 2: 3 / 3