本文共 462 字，大约阅读时间需要 1 分钟。

class NumArray {public:    vector
   
     sum;    NumArray(vector
    
     & nums) {        int L = nums.size();        sum.reserve(L+1);        sum[0] = 0;        for(int i=1;i<=L;i++){            sum[i] = sum[i-1] + nums[i-1];        }    }        int sumRange(int i, int j) {        return sum[j+1] - sum[i];    }};/** * Your NumArray object will be instantiated and called as such: * NumArray* obj = new NumArray(nums); * int param_1 = obj->sumRange(i,j); */
    
   

转载地址：http://enwji.baihongyu.com/