Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. The update(i, val) function modifies nums by updating the element at index i to val. Example: ...
Range Sum Query 2D - Immutable Range Sum Query - Immutable 参考资料: https://leetcode.com/problems/range-sum-query-mutable/ https://leetcode.com/problems/range-sum-query-mutable/discuss/75763/7ms-Java-solution-using-bottom-up-segment-tree https://leetcode.com/problems/range-sum-query-mutable...
sumRange(0, 2) -> 8 Note: The array is only modifiable by the update function. You may assume the number of calls to update and sumRange function is distributed evenly. 题意很简单,但是我的做法总是超时,想了好久没想到更好的方法,网上看了个答案,原来还可以这么做。树状数组没学过,也不知道...
intread(intk)//求1~k的区间和{intsum=0;while(k>0) { sum+=tree[k]; k-=k&-k;//求区间和时会反向用加尾操作,即把c对应的a全部找出来}returnsum; } intsumIK(inti,intk)//i~k的区间和{ sum(i); sum(k+1);returnsum(k+1)-sum(i);//借用前面的求和,但是要注意,实际上应该是k-(i-...
* LeetCode 307. Range Sum Query - Mutable * 区间求和,单点修改问题 * 其解决方法主要为树状数组和线段树 * * 此代码使用树状数组 * * 两点需要注意: * 1.树状数组下标从 1 开始,题目中数据数组从 0 开始 * 解决:index 整体 +1 即可 * 2.树状数组支持单点增加,此题为单点修改。
/* * @lc app=leetcode id=307 lang=cpp * * [307] Range Sum Query - Mutable * * https://leetcode.com/problems/range-sum-query-mutable/description/ * * algorithms * Medium (29.96%) * Likes: 804 * Dislikes: 66 * Total Accepted: 79.7K * Total Submissions: 264.7K * Testcase Example...
307. Range Sum Query - Mutable Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. The update(i, val) function modifies nums by updating the element at index i to val. Example: ...
sumRange(0, 2) -> 9 update(1, 2) sumRange(0, 2) -> 8 Note: The array is only modifiable by the update function. You may assume the number of calls to update and sumRange function is distributed evenly. 描述 update(i, val) 函数可以通过将下标为 i 的数值更新为 val,从而对数列进行...
LeetCode 307. Range Sum Query - Mutable 简介:update(i, val) 函数可以通过将下标为 i 的数值更新为 val,从而对数列进行修改。 Description Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive....
Range Sum Query 2D - Mutable Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2, col2). The above rectangle (with the red border) is defined by (row1, col1) = (2, 1) and (...