lc1480. 一维数组的动态和

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class Solution {
public:
    vector<int> runningSum(vector<int>& nums) {
        int n = nums.size();
        vector<int> pre(n + 1, 0);
        for(int i = 1; i <= n; i++){
            pre[i] = pre[i - 1] + nums[i - 1];
        }

        return vector<int>(pre.begin() + 1, pre.end());
    }
};