Maximum Subarray

问题描述：

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.

class Solution {
public:
    int maxSubArray(vector<int>& nums) {
        int n=nums.size();
        int ans=nums[0],i,j,sum=0;
        for(i=0;i<n;i++){
            sum+=nums[i];
            ans=max(sum,ans);
            sum=max(sum,0);
        }
        return ans;
    }
};