Class Solution
java.lang.Object
g1501_1600.s1524_number_of_sub_arrays_with_odd_sum.Solution
public class Solution
extends java.lang.Object
1524 - Number of Sub-arrays With Odd Sum.
Medium
Given an array of integers arr
, return the number of subarrays with an odd sum.
Since the answer can be very large, return it modulo 109 + 7
.
Example 1:
Input: arr = [1,3,5]
Output: 4
Explanation: All subarrays are [[1],[1,3],[1,3,5],[3],[3,5],[5]]
All sub-arrays sum are [1,4,9,3,8,5].
Odd sums are [1,9,3,5] so the answer is 4.
Example 2:
Input: arr = [2,4,6]
Output: 0
Explanation: All subarrays are [[2],[2,4],[2,4,6],[4],[4,6],[6]]
All sub-arrays sum are [2,6,12,4,10,6].
All sub-arrays have even sum and the answer is 0.
Example 3:
Input: arr = [1,2,3,4,5,6,7]
Output: 16
Constraints:
1 <= arr.length <= 105
1 <= arr[i] <= 100
-
Constructor Summary
-
Method Summary
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
-
Constructor Details
-
Solution
public Solution()
-
-
Method Details
-
numOfSubarrays
public int numOfSubarrays(int[] arr)
-