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  1. #include<bits/stdc++.h>
  2. #define ll long long
  3. using namespace std ;
  4. int main()
  5. {
  6.     ios_base::sync_with_stdio(false);
  7.     cin.tie(0);
  8.     cout.tie(0);
  9.     freopen("CLS.INP","r",stdin);
  10.     freopen("CLS.OUT","w",stdout);
  11.     string s ;
  12. //    CHAO CHUYEN LAM SON
  13.     getline(cin,s);
  14.     ll len = s.length();
  15.     vector<ll>prec(len+3,0);
  16.     vector<ll>pres(len+3,0);
  17.     prec[0]=0;
  18.     pres[len+1]=0;
  19.     prec[0]=0;
  20.     if(s[0]=='C')
  21.     {
  22.         prec[0]++;
  23.     }
  24.     for(ll i= 1 ; i<len;i++)
  25.     {
  26.         if(s[i]=='C')
  27.         {
  28.             prec[i]=prec[i-1]+1;
  29.         }
  30.         else
  31.         {
  32.             prec[i]=prec[i-1];
  33.         }
  34.     }
  35.  
  36.     for(ll i =len-1;i>=0;i--)
  37.     {
  38.         if(s[i]=='S')
  39.         {
  40.             pres[i]=pres[i+1]+1;
  41.         }
  42.         else
  43.         pres[i]=pres[i+1];
  44.     }
  45.     ll res = 0 ;
  46.     for(ll i = 0;i<len;i++)
  47.     {
  48.        if(s[i]=='L')
  49.        {
  50.            res+=pres[i]*prec[i];
  51.        }
  52.     }
  53.     cout<<res<<endl;
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout 0.01s 5260KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/MTqGw6
language:
C++ (gcc 8.3)
created:
13 days ago
visibility:
public

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