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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. main(){
  5.     string s,a;
  6.     getline(cin,s);
  7.     cin>>a;
  8.     int dem=0; int z; long long res; char x,y;
  9.     x=a[0];y=a[1]; res=0;z=0;
  10.     for(int i=s.size()-2;i>=0;--i){
  11.         if(s[i+1]==y) z++;
  12.         if(s[i]==x) res+=z;
  13.     }
  14.     cout<<res;
  15. }
Success #stdin #stdout 0s 16064KB
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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/siRY5J
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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