Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k.
Example 1:
Input:nums = [1,1,1], k = 2 Output: 2
Note:
- The length of the array is in range [1, 20,000].
- The range of numbers in the array is [-1000, 1000] and the range of the integer k is [-1e7, 1e7].
public int subarraySum(int[] nums, int k) { int res = 0; if (nums == null || nums.length == 0) return 0; for (int i = 0; i < nums.length; i++) { int temp = k; for (int j = i; j >= 0; j--) { temp = temp - nums[j]; if (temp == 0) res++; } } return res; }