题目:
题解:
public class Solution {public int subarraySum(int[] nums, int k) {int count = 0, pre = 0;HashMap < Integer, Integer > mp = new HashMap < > ();mp.put(0, 1);for (int i = 0; i < nums.length; i++) {pre += nums[i];if (mp.containsKey(pre - k)) {count += mp.get(pre - k);}mp.put(pre, mp.getOrDefault(pre, 0) + 1);}return count;}
}