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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. #define endl "\n"
  4. #define F first
  5. #define S second
  6. #define loop(a,n) for(int i=a; i<=n ; i++)
  7. #define TIME (1.0 * clock() / CLOCKS_PER_SEC)
  8. #define NAME "Dance"
  9. using namespace std;
  10. int a[1000],f[1000],n,res=0;
  11. string s;
  12. void nhap(){
  13.     cin >> n;
  14.     cin>>s;
  15.     s=' '+s;
  16.     for(int i=1;i<=n;++i) {
  17.         if(s[i]=='A' || s[i] == 'a') a[i] = -1;
  18.         if(s[i]=='B' || s[i] == 'b') a[i] = 1;
  19.     }
  20. }
  21. void solve(){
  22.     a[0]=0;
  23.     f[0]=0;
  24.     for(int i=1;i<=n;++i) f[i]=f[i-1]+a[i];
  25.     for(int i=1;i<=n-1;++i) {
  26.         for(int j=i+1;j<=n;++j) {
  27.             if (f[j] - f[i-1]==0) res++;
  28.         }
  29.     }
  30.     cout<<res;
  31. }
  32.  
  33. int main(){
  34.     ios_base::sync_with_stdio(0);
  35.     cin.tie(0);cout.tie(0);
  36.     freopen(NAME".INP","r",stdin);
  37.     freopen(NAME".OUT","w",stdout);
  38.     nhap();
  39.     solve();
  40.  
  41.     return 0;
  42. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/RS4UpK
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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