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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define f(i,x,y) for(long long i = (x);i < (y);++i)
  4. #define MOD 1000000007
  5.  
  6.  
  7. int main()
  8. {
  9.     int T;
  10.     cin >> T;
  11.     while(T--)
  12.     {
  13.         string txt,pat;
  14.         cin >> txt >> pat;
  15.         int n = txt.size(),m = pat.size();
  16.         int arr[m];
  17.         map<char,int> mp;
  18.         map<char,int> ::iterator it;
  19.         f(i,0,m)
  20.         {
  21.             mp[pat[i]] = i;
  22.             arr[i] = 0;
  23.         }
  24.  
  25.         for(int i = (n-1);i > -1;i--)
  26.         {
  27.             char ch = txt[i];
  28.             if(mp.find(ch) != mp.end())
  29.             {
  30.                 int j = mp[ch];
  31.                 if(j == (m-1))
  32.                     arr[j]++;
  33.                 else if(j < (m-1))
  34.                     arr[j] += arr[j+1];
  35.                 else
  36.                     {;}
  37.             }
  38.         }
  39.         //f(i,0,m)
  40.         //cout << arr[i] << "-";
  41.         cout <<arr[0] << endl;
  42.     }
  43. }
Success #stdin #stdout 0s 3476KB
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https://ideone.com/UWaJQF
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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