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  1. /*  Author: the_kalakar/infinity23
  2.     ----ASEEM BARANWAL----*/
  3. #include<bits/stdc++.h>
  4. #define fastio ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); 
  5. using namespace std;
  6.  
  7. const int maxN = 1000001;
  8. vector<int> G[maxN], vis(maxN), so(maxN);
  9. int n;
  10.  
  11. inline void output(string x){cout << x << endl;}
  12.  
  13. void solve(){
  14.     cin >> n;
  15.     for(int i = 1; i <=n; i++){
  16.         G[i].clear();
  17.         vis[i] = 0;
  18.     }
  19.     int r, m, a, b; cin >> r >> m;
  20.     while(r--){
  21.         cin >> a >> b;
  22.         G[a].push_back(b);
  23.         G[b].push_back(a);
  24.     }
  25.     queue<int> q;
  26.     while(m--){
  27.         int k, s; cin >> k >> s;
  28.         q.push(k);
  29.         if(vis[k]){
  30.             output("No");
  31.             break;
  32.         }
  33.         vis[k] = 1, so[k] = k;
  34.         int curr = 0;
  35.         while(!q.empty() and curr < s){
  36.             int node = q.front(); q.pop();
  37.             for(int x: G[node]){
  38.                 if(vis[x] and so[x] != k){
  39.                     output("No");
  40.                     return;
  41.                 }
  42.                 vis[x] = 1;
  43.                 so[x] = k;
  44.                 q.push(x);
  45.             }
  46.             curr++;
  47.         }
  48.     }
  49.     output("Yes");
  50. }
  51. int main(){
  52.     fastio
  53.     int t;cin>>t;
  54.     while(t--){
  55.         solve();
  56.     }
  57.     return 0;
  58. }
Success #stdin #stdout 0.02s 34496KB
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Yes
https://ideone.com/WlnJ66
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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