ssss, C++ (gcc) - rextester

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#include<bits/stdc++.h>
using namespace std;

string cop(string str1, string str2) 
{ 
    string result; 
    int n1 = str1.length(), n2 = str2.length(); 
      for (int i=0, j=0; i<=n1-1&&j<=n2-1; i++,j++) 
    { 
        if (str1[i] != str2[j]) 
            break; 
        result.push_back(str1[i]); 
    } 
  
    return (result); 
}

int main(){
    int t;cin>>t;
    for(int tt = 1;tt < t+1;tt++){
        int n;cin>>n;
        vector<string> v;
        string s;
        for(int i = 0;i < n;i++){
            cin>>s;
            reverse(s.begin(),s.end());
            v.push_back(s);
        }
        sort(v.begin(),v.end());
        int c = 0,len1 = 100,len2 = 100;
        string pre1 = "",pre2 = "";
        for(int i = 0,j = 1,f = 0;j < n;i+=2,j+=2){
            while(true){
                if(j < n && i < n && v[i][0]!=v[j][0] ){
                    i = j;j = j+1; 
                }
                else
                    break;
            }
            if(j >=n)
                 break;
            pre2 = cop(v[i],v[j]);
            if(pre2!=pre1){
                c++;
                pre1 = pre2;
                len1 = pre1.length();
            }
            else{
                len2 = len1 - 1;
                if(len2 > 0){
                    c++;
                    len1--;
                }
                else{
                    len2 = 0;
                }
            }                
            
        }
        cout<<"Case #"<<tt<<": "<<c*2<<"\n";
    }
    return 0;
}

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Compilation time: 1.73 sec, absolute running time: 0.08 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 1,82 sec