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

int main() {
    string letter="abcdefghijklmnopqrstuvwxyz";
    int k=letter.size();
    int i1,i2,i3;
    string part,bigpart;
    for(i1=0;i1<k;i1++)
    {
        for(i2=0;i2<k;i2++)
        {
            for (i3=0;i3<k;i3++)
            {
                part="";
                part.pb(letter[i1]);
                if(part[0]!=letter[i2]) part.pb(letter[i2]); else continue;
                if(part[0]!=letter[i3]&&part[1]!=letter[i3]) part.pb(letter[i3]); else continue;
                bigpart.pb(letter[i1]);bigpart.pb(letter[i2]);bigpart.pb(letter[i3]);
            }
        }
    }
    string ans="";
    //cout<<bigpart.size()/3;
    while(ans.size()<1000000)
    {
        ans=ans+bigpart;
    }
    /*for (int i=0;i<1000000;i++)
    {
        cout<<ans[i];
    }*/
    int res=0;
    for (int i=0;i<1000000;i++)
    {
        if (ans.substr(i,1)=="a") res++;
    }
    cout<<res;
    return 0;
}

Maybe 1 test is a sort of tricky?

Edited by author 06.04.2017 01:18