Function main

Codeforces_problems/decoding/solution.cpp:26–46

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;  //define length vriable
    cin>>n; //tajing length vriable
    string s,s1;  //define two strings
    cin>>s; //taking the cncoded string
    s1=s[0]; //start transform it to the original form
    if(n%2==0){ //we check if the length is even
        for(int i=1;i<n;i++){ //we loop through the string elements of the endcoded one
            if(i%2!=0) s1+=s[i];  //we add it in the second and swap this step it the next iteration
            else s1=s[i]+s1;  //we add it in the first and swap this step it the next iteration
        }
    }
    else{
        for(int i=1;i<n;i++){//the same as even but with different coditions to start with te right condition only
            if(i%2==0) s1+=s[i];
            else s1=s[i]+s1;
        }
    }
    cout<<s1;
}