左右元素和的差值

class Solution {
public:
    vector<int> leftRigthDifference(vector<int>& nums) {
        vector<int> leftSum;
        vector<int> rightSum;
        for (int i = 0; i < nums.size(); i++) {
            int leftsum = 0;
            for (int j = 0; j < i; j++) {
                leftsum += nums[j];
            }
            leftSum.push_back(leftsum);
            int rightsum = 0;
            for (int j = i + 1; j < nums.size(); j++) {
                rightsum += nums[j];
            }
            rightSum.push_back(rightsum);
        }
        vector<int> ans;
        for (int i = 0; i < leftSum.size(); i++) {
            ans.push_back(abs(leftSum[i] - rightSum[i]));
        }
        return ans;
    }
};