#include <bits/stdc++.h>
using namespace std;

class Solution {
public:
    /* Function to find the number of subarrays
    nice subarrays with k odd numbers*/
    int numberOfOddSubarrays(vector<int>& nums, int k) {
        
        /*Calculate the number of subarrays with 
        sum exactly equal to k by using the 
        difference between subarrays with sum less
        than or equal to k and those with sum
        less than or equal to k-1*/
        return helper(nums, k) - helper(nums, k - 1);
    }
    
private:
    /* Helper function to find the number