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  1. //cut and paste
  2. //dynamic programming
  3.  
  4. #include <iostream>
  5. #include <vector>
  6. #include <string>
  7.  
  8. using namespace std;
  9.  
  10. int main()
  11. {
  12.  
  13.     //freopen("3.txt", "r", stdin);
  14.     //freopen("ans3.txt","w",stdout);
  15.  
  16.     int n1,n2,ans,pos,flag;
  17.     int t;
  18.     cin>>t;
  19.     cin.ignore(256,'\n');
  20.     while(t--)
  21.     {
  22.         string s1, s2;
  23.         cin >> s1 >> s2;
  24.         n1=s1.length();
  25.         n2=s2.length();
  26.  
  27.         vector< vector<int> > l(n1 + 1, vector<int>(256, n1));
  28.         //l[i][j] will contain first occurrence of character j in the string s1[i...n1-1]
  29.         //if j is not in s1[i...n1-1], l[i][j]=n1
  30.  
  31.         for (int i = n1 - 1; i >= 0; i--)
  32.         {
  33.             for (char j = 'a'; j <= 'z'; j++)
  34.             {
  35.                 if (s1[i] == j)
  36.                     l[i][j] = i;
  37.  
  38.                 else if (i + 1 < n1)
  39.                     l[i][j] = l[i + 1][j];
  40.  
  41.             }
  42.  
  43.         }
  44.  
  45.         ans = 1;
  46.         pos = 0;
  47.         flag=1;
  48.  
  49.         for (int i = 0; i < n2 && flag; i++)
  50.         {
  51.             pos = l[pos][s2[i]];
  52.  
  53.             if (pos == n1)
  54.             {
  55.                 ans++;
  56.                 pos = 0;
  57.                 pos = l[pos][s2[i]];
  58.  
  59.                 if (pos == n1)
  60.                 {
  61.                     cout<<-1<<endl;
  62.                     flag=0;
  63.                 }
  64.             }
  65.  
  66.             pos++;
  67.         }
  68.  
  69.         if(flag)
  70.             cout<<ans<<endl;
  71.  
  72.     }
  73.  
  74.     return 0;
  75. }
Runtime error #stdin #stdout 0.15s 2868KB
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https://ideone.com/BuHYnn
language:
C++ 4.3.2 (gcc-4.3.2)
created:
8 years ago
visibility:
secret

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