
题目:输入一个整型数组,数组里有正数也有负数。数组中一个或连续的多个整数组成一个子数组。求所有子数组的和的最大值。要求时间复杂度为O(n)
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package offer; public class { public int findGreatestSum(int[] arr){ int greatest = 0x80000000; int cursum=0; for(int i=0;i<arr.length;i++){ if(cursum<=0) cursum=arr[i]; else cursum+=arr[i]; if(greatest<cursum) greatest=cursum; } return greatest; } public static void main(String[] args){ int[] arr={-1,-2,-3,-10,-4,-7,2,-5}; t31 test = new t31(); System.out.println(test.findGreatestSum(arr)); } }
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