LEECODE 1480一维数组的动态和

class Solution {
public:
    vector<int> runningSum(vector<int>& nums) {
        vector<int> runningSum;
        int sum = 0;
        int len = nums.size();
        for(int i = 0; i < len; i++)
        {
            sum = sum + nums[i];
            runningSum.push_back(sum);
        }
        return runningSum;

    }
};