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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long ll;
  5.  
  6. #define error(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); cerr << '\n'; }
  7. void err(istream_iterator<string> it) {}
  8. template<typename T, typename... Args> void err(istream_iterator<string> it, T a, Args... args) { cerr << *it << " = " << a << " "; err(++it, args...); }
  9.  
  10. #define        optimize           ios::sync_with_stdio(0); cin.tie(0);
  11. #define PI    acos(-1.0)
  12. #define YES cout<<"YES"<<endl;
  13. #define NO cout<<"NO"<<endl;
  14. #define RESET(a, b) memset(a, b, sizeof(a))
  15. #define pii pair <int, int>
  16. #define min3(a, b, c) min(c, min(a, b))
  17. #define max3(a, b, c) max(c, max(a, b))
  18.  
  19. const ll MX = 2e5 + 105;
  20.  
  21. vector <int> adj[4005];
  22. int black[4005];
  23. int white[4005];
  24. string str;
  25.  
  26. void dfs(int u, int par)
  27. {
  28.     for(auto v: adj[u]){
  29.         if(v == par) continue;
  30.         dfs(v, u);
  31.         white[u] += white[v];
  32.         black[u] += black[v];
  33.     }
  34.     if(str[u-1] == 'W') white[u]++;
  35.     else black[u]++;
  36. }
  37.  
  38. void solve()
  39. {
  40.     int n;
  41.     cin>>n;
  42.  
  43.     for(int i = 2; i <= n; i++){
  44.         int par;
  45.         cin>>par;
  46.         adj[par].push_back(i);
  47.         adj[i].push_back(par);
  48.     }
  49.     cin>>str;
  50.  
  51.     dfs(1, 1);
  52.  
  53.     int ans = 0;
  54.     for(int i = 1; i <= n; i++){
  55.         if(white[i] == black[i]) ans++;
  56. //        error(i, white[i], black[i]);
  57.     }
  58.     cout<<ans<<endl;
  59.  
  60.     for(int i = 1; i <= n; i++){
  61.         adj[i].clear();
  62.         white[i] = 0;
  63.         black[i] = 0;
  64.     }
  65. }
  66.  
  67. int main()
  68. {
  69.     int t;
  70.     cin>>t;
  71.     while(t--){
  72.         solve();
  73.     }
  74. }
  75.  
Success #stdin #stdout 0.06s 5436KB
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https://ideone.com/Bt2BYg
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
secret

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