Untitled

/*
It calculates the parity change between adjacent elements in nums, stores the prefix sum of these changes, and then determines if the parity change within a given range specified by each query matches the length of the range. The result is stored in a boolean array ans, which is returned at the end.
*/
class Solution {
    public boolean[] isArraySpecial(int[] nums, int[][] queries) {
        int n = nums.length;
        int[] parityChange = new int[n - 1];
        for (int i = 0; i < n - 1; i++) {
            parityChange[i] = (nums[i] % 2 != nums[i + 1] % 2) ? 1 : 0;
        }
        int[] prefixSum = new int[n];
        for (int i = 1; i < n; i++) {
            prefixSum[i] = prefixSum[i - 1] + (i-1<n-1?parityChange[i-1]:0);
        }
        boolean[] ans = new boolean[queries.length];
        for (int i = 0; i < queries.length; i++) {
            int start=queries[i][0];
            int end=queries[i][1];
            if (start==end) {
                ans[i]=true; 
            } else {
                ans[i]=(prefixSum[end] -prefixSum[start]==end-start);
            }
        }
        
        return ans;
    }
}