746 B. Decoding.cpp

//============================================================================
//problem link:http://codeforces.com/contest/746/problem/B
// Name        : .cpp
// Author      : mohand sakr
// Version     :
// Copyright   : use it under your responsibility
// Description : Hello World in C++, Ansi-style
//status:accepted
//============================================================================

#include <iostream>
#include<string>
#include<vector>
using namespace std;

int main() {
	int len;
	 string s;
	 cin>>len;
	 cin>>s;
	  vector<char> vect;

	  while(len!=0){
		  if(len%2==1){
			  vect.push_back(s[0]);
		  }else{
			  vect.insert(vect.begin(),s[0]);
		  }
		  s.erase(0,1);
		  len=s.length();
	  }
	  for(int i=0;i<vect.size();i++){
		  cout<<vect[i];
	  }

	return 0;
}