C++ CODE TO CHECK WHETHER TWO STRINGS ARE PERMUTATIONS OF EACH OTHER OR NOT

#include <iostream>
#include <cstring>
using namespace std;

bool isPermutation(char input1[], char input2[]) {
    int freq[256] = {0};
    for(int i = 0; input1[i] != '\0'; i++) { 
        int index = input1[i];
        freq[index]++; 
    }
    for(int i = 0; input2[i] != '\0'; i++) {
        int index = input2[i];
        freq[index]--; 
    }
    for(int i = 0; i < 256; i++) {
        if(freq[i] != 0) { 
            return false;
        }
    }
    return true;
}

int main() {
    int size = 1e6;
    char str1[size];
    char str2[size];
    cin >> str1 >> str2;
    cout << (isPermutation(str1, str2) ? "true" : "false");
}