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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);*/