1031. Hello World for U (20)

Given any string of N (>=5) characters, you are asked to form the characters into the shape of U. For example, "helloworld" can be printed as:

h  d
e  l
l  r
lowo

Input Specification:

Each input file contains one test case. Each case contains one string with no less than 5 and no more than 80 characters in a line. The string contains no white space.

Output Specification:

For each test case, print the input string in the shape of U as specified in the description.

helloworld!

h   !
e   d
l   l
lowor

#pragma warning(disable:4996)
#include <stdio.h>
#include <string>
#include <iostream>
using namespace std;
int main(void) {
	int n1, n2, n3;
	string s;
	cin >> s;
	n1 = n3 = (s.length() - 1) / 3;
	n1++; n3++;
	n2 = s.length() + 2 - 2 * n1;
	for (int i = 0; i < n1 - 1; i++) {
		cout << s[i];
		for (int i = 0; i < n2 - 2; i++)
			cout << ‘ ‘;
		cout << s[s.length() - i - 1] << endl;
	}
	for (int i = n1 - 1; i < n1 + n2-1; i++) {
		cout << s[i];
	}
	
	return 0;
}