Saturday, November 14, 2015

[leetcode] Maximum Array

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public class Solution {
    public int maxSubArray(int[] nums) {
        if (nums == null || nums.length == 0){
            return 0;
        }
        int singleLargest = Integer.MIN_VALUE;
        int maxSum = 0;
        int localSum = 0;
        boolean sumStarted = false;
        for(int i = 0; i < nums.length; i++){
            singleLargest = Math.max(nums[i], singleLargest);
            if (nums[i] >= 0){
                sumStarted = true;
                localSum = Math.max(localSum+nums[i], nums[i]);
                maxSum = Math.max(localSum, maxSum);
            }else if (sumStarted){
                localSum += nums[i];
            }
        }
        
        if (sumStarted){
            return maxSum;
        }
        return singleLargest;
    }
}

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