数组·数学模式

旋转图像

Rotate an n x n matrix 90 degrees clockwise in-place using array manipulation and mathematical indexing techniques effic…

加一

Given a number as an array of digits, increment it by one and return the updated array of digits.

计数质数

Count all prime numbers less than a given integer n using efficient array and math-based enumeration techniques.

路径交叉

Determine if a path defined by sequential distances on a 2D plane crosses itself using array and math reasoning.

打乱数组

Shuffle an Array requires designing a class to randomly permute an integer array while ensuring all permutations are equ…

最小操作次数使数组元素相等

Compute the fewest steps to make all elements equal by incrementing n-1 array items, applying array and math reasoning.

最小操作次数使数组元素相等 II

Find the minimum moves to equalize all array elements using increments or decrements with array and math techniques.

汉明距离总和

Calculate the total Hamming distance between all pairs in an integer array using efficient bit manipulation techniques.

最小时间差

Calculate the smallest time difference between clock points using array manipulation and mathematical conversions effici…

安装栅栏

Find the perimeter fence of a garden by determining the outermost trees in a set of given tree coordinates.

区间加法 II

Range Addition II requires counting maximum values in a matrix after incremental operations using array and math reasoni…

三个数的最大乘积

Find three numbers in an array whose product is the largest using sorting and careful handling of negative values.

优美的排列 II

Construct a beautiful arrangement of integers from 1 to n with k distinct integers, optimizing for time and space effici…

全局倒置与局部倒置

Determine if every global inversion in a permutation array is also a local inversion using array and math logic efficien…

变为棋盘

Determine the minimum swaps of rows or columns to convert an n x n binary board into a valid chessboard configuration.

逃脱阻碍者

Escape The Ghosts tests your ability to analyze movements in an infinite grid while racing against ghost positions using…

黑板异或游戏

The Chalkboard XOR Game is a game theory problem involving array manipulation and bitwise XOR, where players alternate e…

最大三角形面积

Find the area of the largest triangle formed by three distinct points on a 2D plane.

猜猜这个单词

Master the Guess the Word problem by applying array manipulation, match-counting math, and strategic interactive guessin…

三维形体投影面积

Calculate the projection area of a 3D shape defined by a grid of towers with varying heights.

子序列宽度之和

Calculate the sum of widths for all subsequences in an integer array using sorting and combinatorial math efficiently.

三维形体的表面积

Solve the Surface Area of 3D Shapes problem using array manipulation and mathematical formulas to calculate surface area…

最小差值 I

Find the smallest score of an array after applying an operation to each element within a given range.

三等分

Divide a binary array into three contiguous parts such that each part represents the same integer value in binary, using…