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leetcode Maximum Subarray

题目: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.

找一个子串的和最大。返回最大值。据说叫做动态规划。几行就搞定了。就是max和sum比大小,sum的取值是,如果之前wei负数,直接去除,如果不为负数就加上当前的数再和max比较。

class Solution {public:    int maxSubArray(int A[], int n) {        // Start typing your C/C++ solution below        // DO NOT write int main() function        int sum = A[0], max = A[0];        for (int i = 1; i < n; i++) {            sum = sum < 0 ? A[i] : sum + A[i];            max = sum > max ? sum : max;        }        return max;    }};

 这个哥们写了好多。

leetcode Maximum Subarray