public int (int[] nums) {
        if (nums == null || nums.length == 0) {
            return 0;
        }
        int preSum = nums[0];
        int maxSum = preSum;
        for (int i = 1; i < nums.length; i++) {
            preSum = preSum > 0 ? preSum + nums[i] : nums[i];
            maxSum = Math.max(maxSum, preSum);
        }
        return maxSum;
    }