[color=darkred][size=large][b]题目描述[/b][/size][/color]
[size=medium]Find the contiguous subarray within an array (containing at least one number) which has the largest sum.
For example, given the array [−2,1,−3,4,−1,2,1,−5,4],
the contiguous subarray [4,−1,2,1] has the largest sum = 6.[/size]
[size=large][color=darkred][b]思路(1)[/b][/color][/size]
[size=medium]从首元素开始,依次计算和后面值的和,并取最大值;直到进行到最后一个元素。但是这种方法超时,时间复杂度为O(n),需要寻找更加有效的方法。[/size]
[size=large][color=darkred][b]思路(1)代码[/b][/color][/size]
[size=medium]Find the contiguous subarray within an array (containing at least one number) which has the largest sum.
For example, given the array [−2,1,−3,4,−1,2,1,−5,4],
the contiguous subarray [4,−1,2,1] has the largest sum = 6.[/size]
[size=large][color=darkred][b]思路(1)[/b][/color][/size]
[size=medium]从首元素开始,依次计算和后面值的和,并取最大值;直到进行到最后一个元素。但是这种方法超时,时间复杂度为O(n),需要寻找更加有效的方法。[/size]
[size=large][color=darkred][b]思路(1)代码[/b][/color][/size]
package leetcode;
public class MaximumSubarray {
public int maxSubArray(int[] A) {
int length = A.length;
int sum = A[0];
for(int i = 0; i < length; i++){
int temp = A[i];
if(temp > sum) sum = temp;
for(int j = i + 1; j < length; j++){
temp += A[j];
if(temp > sum) sum = temp;
}
}
return sum;
}
}