Given two strings, write a method to decide if one is a permutation of the other.

Careercup1.3.cpp

#include "stdafx.h"
#include <string>
#include <iostream>

const int SIZE = 256;

bool IsPermutation(std::string, std::string);
int main()
{
  using namespace std;
	//two strings to compare
	string str1;
	string str2;
	cin>>str1>>str2;
	bool res = IsPermutation(str1,str2);
	if(res)
	{
		cout<<"Is Permutation"<<endl;
	}
	else
	{
		cout<<"Is not Permutation"<<endl;
	}
	return 0;
}

bool IsPermutation(std::string str1, std::string str2)
{
	int *chaCount = new int[SIZE]();
	if(str1.size()==str2.size())
	{
		for(int i=0,size=str1.size();i<size;i++)
		{
			chaCount[int(str1[i])]++;
		}
		for(int i=0,size=str2.size();i<size;i++)
		{
			chaCount[int(str2[i])]--;
		}
		for(int i=0;i<SIZE;i++)
		{
			if(chaCount[i]!=0)
			{
				return false;
			}
		}
		return true;
	}
	else
	{
		return false;
	}
}