303. 区域和检索 - 数组不可变前缀和

Posted 2021-10-23 幽殇默

https://leetcode-cn.com/problems/range-sum-query-immutable/

class NumArray 
{
public:
    vector<int>s;
    NumArray(vector<int>& nums) 
    {
        s.push_back(0);
        int temp=0;
        for(int i=0;i<nums.size();i++)
        {
            s.push_back(temp+nums[i]);
            temp+=nums[i];
        }
    }
    
    int sumRange(int left, int right) 
    {
        return s[right+1]-s[left];
    }
};

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