fork download 
  1. #include <bits/stdc++.h>
  2. #define ll long long int
  3. using namespace std;
  4. const ll N = 105;
  5. vector<ll> graph[N];
  6. ll visited[N];
  7. ll level[N];
  8.  
  9. ll bfs(ll src, ll des) {
  10.     queue<ll> q;
  11.     q.push(src);
  12.     visited[src]=1;
  13.     while(!q.empty()) {
  14.         ll cur = q.front();
  15.         q.pop();
  16.         for(ll child: graph[cur]) {
  17.             if(!visited[child]) {
  18.                 q.push(child);
  19.                 visited[child] = 1;
  20.                 level[child]=level[cur]+1;
  21.             }
  22.         }
  23.     }
  24.     return level[des];
  25. }
  26. int main() {
  27.     ios_base::sync_with_stdio(false);
  28.     cin.tie(0);
  29.     ll n,src,des;cin>>n>>src>>des;
  30.     for(ll i=0;i<n;i++) {
  31.         for(ll j=0;j<n;j++) {
  32.             ll x; cin>>x;
  33.             if(x==1) {
  34.                 graph[i+1].push_back(j+1);
  35.             }
  36.         }
  37.     }
  38.     cout<<bfs(src, des)<<"\n";
  39. }
  40.  
Success #stdin #stdout 0.01s 5328KB
comments (?)
stdin 
4 4 3
0 1 1 1
1 0 1 0
1 1 0 0
1 0 0 0
stdout 
2
https://ideone.com/w1X6Ku
https://e...content-available-to-author-only...p.com/en/problems/2401
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!