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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4.  
  5. int main()
  6. {
  7.     int t; cin>>t;
  8.     while(t--)
  9.     {
  10.         int n; cin>>n;
  11.         string s; cin>>s;
  12.         vector<int>leaf;
  13.         int mp[n+1];
  14.         memset(mp,0,sizeof(mp));
  15.         vector<int>par(n+2);
  16.         par[1]=-1;
  17.         for(int i=0;i<n;i++){
  18.             int x,y; cin>>x>>y;
  19.             if(x==0 && y==0){
  20.                 leaf.push_back(i+1);
  21.             }else{
  22.                 mp[x]=0;
  23.                 mp[y]=1;
  24.                 par[x]=i+1;
  25.                 par[y]=i+1;
  26.             }
  27.         }
  28.         int cnt=0;
  29.         int ans=INT_MAX;
  30.         int itr=0;
  31.         for(auto x: leaf){
  32.  
  33.                 int u=x;
  34.                 cnt=0;
  35.                 while(u!=-1 ){
  36.  
  37.                     int left=0, right=0;
  38.                     if(mp[u]==0)left=1;
  39.                     else right=1;
  40.                     u=par[u];
  41.                     if(left && s[u-1]!='L')cnt++;
  42.                    else if(right && s[u-1]!='R')cnt++;
  43.                     else if(s[u-1]=='U')cnt++;
  44.                    if(cnt-1>=ans)break;
  45.  
  46.  
  47.                 }
  48.             ans=min(ans, cnt-1);
  49.  
  50.         }
  51.  
  52.     cout<<ans<<endl;
  53.  
  54.     }
  55. }
Runtime error #stdin #stdout 0.81s 2095876KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/uV3iX5
language:
C++14 (gcc 8.3)
created:
344 days ago
visibility:
secret

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