题目：

题解：

class Solution {public boolean checkSubarraySum(int[] nums, int k) {int m = nums.length;if (m < 2) {return false;}Map<Integer, Integer> map = new HashMap<Integer, Integer>();map.put(0, -1);int remainder = 0;for (int i = 0; i < m; i++) {remainder = (remainder + nums[i]) % k;if (map.containsKey(remainder)) {int prevIndex = map.get(remainder);if (i - prevIndex >= 2) {return true;}} else {map.put(remainder, i);}}return false;}
}