小旭讲解 基础算法系列 – 前缀和之区间和检索 数组不可变
小旭讲解 基础算法系列 – 前缀和之区间和检索 数组不可变

视频讲解

代码

class NumArray {
public:
    vector<int> sum;
    NumArray(vector<int>& nums) {
        int n = nums.size();
        sum = vector<int>(n + 1, 0);
        for (int i=1;i<=n;++i) sum[i] = sum[i-1] + nums[i-1];
    }
    
    int sumRange(int i, int j) {
        return sum[j+1] - sum[i];
    }
};

参考

[1]. LeetCode 303. https://leetcode.com/problems/range-sum-query-immutable/

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