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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int f[100005]; // caay o vi tri i da chet chua
  5.  
  6.  
  7. int main(){
  8.  
  9.     string s;
  10.     while(cin >> s){
  11.         f[s.size()]++;
  12.     }
  13.     vector<int> a;
  14.     for(int i = 1; i <= 100000; i++){
  15.         if(f[i] >= 2){
  16.             int cnt = f[i]/2;
  17.             while(cnt--)a.push_back(i);
  18.         }
  19.     }
  20.     sort(a.begin(), a.end(), greater<int>());
  21.     int totals = 0;
  22.     for(int i = 1; i < a.size(); i+= 2){
  23.         totals += a[i-1]* a[i];
  24.     }
  25.     cout << totals;
  26.  
  27.     return 0;
  28. }
  29.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/hnvsIl
language:
C++14 (gcc 8.3)
created:
13 hours ago
visibility:
public

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