Submission #9541

#	Time	Username	Problem	Language	Result	Execution time	Memory
9541		jaehadad	Your life (kriii2_Y)	C++14	4 / 4	92 ms	7704 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>
using namespace std;
int n, m;
vector<int> adj[100000];
const int LARGE = 987654321;
int main() {
  cin.sync_with_stdio(false);

  cin >> n >> m;
  for(int i = 0; i < m; ++i) {
    int a, b;
    cin >> a >> b;
    --a; --b;
    adj[a].push_back(b);
  }

  vector<int> c(n);
  c[n-1] = 0;
  for(int i = n-2; i >= 0; --i) {
    c[i] = LARGE;
    for(int j: adj[i]) 
      c[i] = min(c[i], c[j] + 1);
  }

  cout << (c[0] == LARGE ? -1 : c[0]) << '\n';
}

• Subtask 1: 1 / 1
• Subtask 2: 3 / 3