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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. const long long MaxN = 1e5 + 5;
  4. string s;
  5. long long prefix[MaxN][30],ans=0,m;
  6. int main()
  7. {
  8.     ios_base::sync_with_stdio(0);
  9.     cin.tie(0);
  10.     if(fopen("B2.inp","r"))
  11.     {
  12.         freopen("B2.inp","r",stdin);
  13.         freopen("B2.out","w",stdout);
  14.     }
  15.     cin >> s;
  16.     m=s.size();
  17.     s=" " + s;
  18.     for (long long i=1; i<=m; i++)
  19.     {
  20.         for (long long j=1; j<=26;j++)
  21.         {
  22.             prefix[i][j]=prefix[i-1][j];
  23.             if(j==s[i]-'a'+1)
  24.             {
  25.                 prefix[i][j]++;
  26.             }
  27.         }
  28.     }
  29.     for (long long len =1; len<=m/2; len++)
  30.     {
  31.         for (long long l=1; l+2*len-1<=m; l++)
  32.         {
  33.             bool check = true;
  34.             for (long long i=1; i<=26; i++)
  35.             {
  36.                 long long t_1=prefix[l+len-1][i]-prefix[l-1][i];
  37.                 long long t_2=prefix[l+2*len-1][i]-prefix[l+len-1][i];
  38.                 if(!((t_1>0&&t_2>0)||(t_1==0&&t_2==0)))
  39.                 {
  40.                     check = false;
  41.                 }
  42.             }
  43.             if(check)
  44.             {
  45.                 ans++;
  46.             }
  47.         }
  48.     }
  49.     cout << ans;
  50. }
  51.  
Success #stdin #stdout 0s 5316KB
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https://ideone.com/YE90eT
language:
C++14 (gcc 8.3)
created:
20 hours ago
visibility:
public

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