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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. const int Mod=1e9+7;
  5. const ll INF = 10000000000000;
  6. const int N = 1e6+7;
  7.  
  8.     void solve() {
  9.         int n;
  10.         cin >> n;
  11.         string s;
  12.         cin >> s;
  13.         vector<int> a(n+1,1);
  14.         for(int i=0;i<n;i++){
  15.            if(s[i]=='p'){
  16.             for(int j=i+1;j<n;j++){
  17.                 if(s[j]=='s'){
  18.                     cout << "NO\n";
  19.                     return;
  20.                 }
  21.             }
  22.            }
  23.            if(s[i]=='s'){
  24.              for(int j=i+1;j<n;j++){
  25.                 if(s[j]=='p'){
  26.                     if(j-i+1<min(j+1,n-i)){
  27.                         cout << "NO\n";
  28.                         return;
  29.                     }
  30.                 }
  31.              }   
  32.            }
  33.         }
  34.         cout << "YES\n";         
  35.     }
  36.  
  37. int main(){ 
  38.     ios::sync_with_stdio(false);
  39.     cin.tie(nullptr);
  40.  
  41.     int t;
  42.     cin >> t;
  43.     while (t--) solve();
  44.  
  45.     return 0;
  46. }
  47.  
Success #stdin #stdout 0.01s 5304KB
comments (?)
stdin
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9
4
s.sp
6
pss..s
5
ppppp
2
sp
4
.sp.
8
psss....
1
.
8
pspspsps
20
....................
stdout
copy 
YES
NO
YES
YES
NO
NO
YES
NO
YES
https://ideone.com/gT83Ys
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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