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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long 
  4. #define dbg(x) cout<<#x<<" : "<<x<<endl
  5. #define rep(i,a,b) for(int i=(a);i<=(b);i++)
  6. #define maxn 100005
  7. vector<ll> edges[maxn];
  8. ll dau[maxn],d[maxn];
  9. ll n,m;
  10. void bfs(ll source){
  11.     dau[source]=1;
  12.     d[source]=0;
  13.     queue<ll> q;
  14.     q.push(source);
  15.     while(!q.empty()){
  16.         ll p = q.front();
  17.         q.pop();
  18.         for(auto v: edges[p]){
  19.             if(dau[v]==1) continue;
  20.             dau[v]=1;
  21.             d[v]=d[p]+1;
  22.             q.push(v);
  23.         }
  24.     }
  25. }
  26. int main(){
  27.     // freopen("input.txt","r",stdin);
  28.     // freopen("output.txt","w",stdout);
  29.     cin>>n>>m;
  30.     for(ll i=0;i<m;i++){
  31.         ll u,v,t;
  32.         cin>>u>>v>>t;
  33.         u--,v--,t--;
  34.         edges[u].push_back(v);
  35.         edges[u].push_back(t);
  36.         edges[v].push_back(u);
  37.         edges[t].push_back(u);
  38.     }
  39.     bfs(0);
  40.     for(ll i=0;i<n;i++) cout<<d[i]+1<<'\n';
  41.     return 0;
  42. }
Success #stdin #stdout 0.01s 5968KB
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https://ideone.com/6Ngn0o
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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