1.题目要求:

2.题目代码:

class NumArray {
public:
    vector<int> array;
    NumArray(vector<int>& nums) {
        array = nums;
    }
    
    int sumRange(int left, int right) {
        int sum = 0;
        while(left <= right){
            sum += array[left];
            left++;
        }
        return sum;
    }
};

/**
 * Your NumArray object will be instantiated and called as such:
 * NumArray* obj = new NumArray(nums);
 * int param_1 = obj->sumRange(left,right);
 */