leetcode.com 2026-03-12
🔴3600.maximize-spanning-tree-stability-with-upgrades
🏷️ Tags
#greedy #union_find #graph #binary_search #minimum_spanning_tree
🔴3600.maximize-spanning-tree-stability-with-upgrades
🏷️ Tags
#greedy #union_find #graph #binary_search #minimum_spanning_tree
Telegraph
maximize-spanning-tree-stability-with-upgrades
You are given an integer n, representing n nodes numbered from 0 to n - 1 and a list of edges, where edges[i] = [ui, vi, si, musti]:
leetcode.cn 2026-03-13
🟡3296.minimum-number-of-seconds-to-make-mountain-height-zero
🏷️ Tags
#greedy #array #math #binary_search #heap_priority_queue
🟡3296.minimum-number-of-seconds-to-make-mountain-height-zero
🏷️ Tags
#greedy #array #math #binary_search #heap_priority_queue
Telegraph
minimum-number-of-seconds-to-make-mountain-height-zero
给你一个整数 mountainHeight 表示山的高度。 同时给你一个整数数组 workerTimes,表示工人们的工作时间(单位:秒)。 工人们需要 同时 进行工作以 降低 山的高度。对于工人 i :
leetcode.com 2026-03-13
🟡3296.minimum-number-of-seconds-to-make-mountain-height-zero
🏷️ Tags
#greedy #array #math #binary_search #heap_priority_queue
🟡3296.minimum-number-of-seconds-to-make-mountain-height-zero
🏷️ Tags
#greedy #array #math #binary_search #heap_priority_queue
Telegraph
minimum-number-of-seconds-to-make-mountain-height-zero
You are given an integer mountainHeight denoting the height of a mountain. You are also given an integer array workerTimes representing the work time of workers in seconds. The workers work simultaneously to reduce the height of the mountain. For worker i:
leetcode.cn 2026-03-14
🟡1415.the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
🏷️ Tags
#string #backtracking
🟡1415.the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
🏷️ Tags
#string #backtracking
Telegraph
the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
一个 「开心字符串」定义为:
leetcode.com 2026-03-14
🟡1415.the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
🏷️ Tags
#string #backtracking
🟡1415.the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
🏷️ Tags
#string #backtracking
Telegraph
the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
A happy string is a string that:
leetcode.cn 2026-03-16
🟡1878.get-biggest-three-rhombus-sums-in-a-grid
🏷️ Tags
#array #math #matrix #prefix_sum #sorting #heap_priority_queue
🟡1878.get-biggest-three-rhombus-sums-in-a-grid
🏷️ Tags
#array #math #matrix #prefix_sum #sorting #heap_priority_queue
Telegraph
get-biggest-three-rhombus-sums-in-a-grid
给你一个 m x n 的整数矩阵 grid 。 菱形和 指的是 grid 中一个正菱形 边界 上的元素之和。本题中的菱形必须为正方形旋转45度,且四个角都在一个格子当中。下图是四个可行的菱形,每个菱形和应该包含的格子都用了相应颜色标注在图中。 注意,菱形可以是一个面积为 0 的区域,如上图中右下角的紫色菱形所示。 请你按照 降序 返回 grid 中三个最大的 互不相同的菱形和 。如果不同的和少于三个,则将它们全部返回。 示例 1: 输入:grid = [[3,4,5,1,3],[3,3,4,2,3]…
leetcode.com 2026-03-16
🟡1878.get-biggest-three-rhombus-sums-in-a-grid
🏷️ Tags
#array #math #matrix #prefix_sum #sorting #heap_priority_queue
🟡1878.get-biggest-three-rhombus-sums-in-a-grid
🏷️ Tags
#array #math #matrix #prefix_sum #sorting #heap_priority_queue
Telegraph
get-biggest-three-rhombus-sums-in-a-grid
You are given an m x n integer matrix grid. A rhombus sum is the sum of the elements that form the border of a regular rhombus shape in grid. The rhombus must have the shape of a square rotated 45 degrees with each of the corners centered in a grid…
leetcode.cn 2026-03-17
🟡1727.largest-submatrix-with-rearrangements
🏷️ Tags
#greedy #array #matrix #sorting
🟡1727.largest-submatrix-with-rearrangements
🏷️ Tags
#greedy #array #matrix #sorting
Telegraph
largest-submatrix-with-rearrangements
给你一个二进制矩阵 matrix ,它的大小为 m x n ,你可以将 matrix 中的 列 按任意顺序重新排列。 请你返回最优方案下将 matrix 重新排列后,全是 1 的子矩阵面积。 示例 1: 输入:matrix = [[0,0,1],[1,1,1],[1,0,1]] 输出:4 解释:你可以按照上图方式重新排列矩阵的每一列。 最大的全 1 子矩阵是上图中加粗的部分,面积为 4 。 示例 2: 输入:matrix = [[1,0,1,0,1]] 输出:3 解释:你可以按照上图方式重新排列矩阵的每一列。…
leetcode.com 2026-03-17
🟡1727.largest-submatrix-with-rearrangements
🏷️ Tags
#greedy #array #matrix #sorting
🟡1727.largest-submatrix-with-rearrangements
🏷️ Tags
#greedy #array #matrix #sorting
Telegraph
largest-submatrix-with-rearrangements
You are given a binary matrix matrix of size m x n, and you are allowed to rearrange the columns of the matrix in any order. Return the area of the largest submatrix within matrix where every element of the submatrix is 1 after reordering the columns optimally.…
leetcode.cn 2026-03-18
🟡3070.count-submatrices-with-top-left-element-and-sum-less-than-k
🏷️ Tags
#array #matrix #prefix_sum
🟡3070.count-submatrices-with-top-left-element-and-sum-less-than-k
🏷️ Tags
#array #matrix #prefix_sum
Telegraph
count-submatrices-with-top-left-element-and-sum-less-than-k
给你一个下标从 0 开始的整数矩阵 grid 和一个整数 k。 返回包含 grid 左上角元素、元素和小于或等于 k 的 子矩阵的数目。 示例 1: 输入:grid = [[7,6,3],[6,6,1]], k = 18 输出:4 解释:如上图所示,只有 4 个子矩阵满足:包含 grid 的左上角元素,并且元素和小于或等于 18 。 示例 2: 输入:grid = [[7,2,9],[1,5,0],[2,6,6]], k = 20 输出:6 解释:如上图所示,只有 6 个子矩阵满足:包含 grid …
leetcode.com 2026-03-18
🟡3070.count-submatrices-with-top-left-element-and-sum-less-than-k
🏷️ Tags
#array #matrix #prefix_sum
🟡3070.count-submatrices-with-top-left-element-and-sum-less-than-k
🏷️ Tags
#array #matrix #prefix_sum
Telegraph
count-submatrices-with-top-left-element-and-sum-less-than-k
You are given a 0-indexed integer matrix grid and an integer k. Return the number of submatrices that contain the top-left element of the grid, and have a sum less than or equal to k. Example 1: Input: grid = [[7,6,3],[6,6,1]], k = 18 Output: 4 Explanation:…
leetcode.cn 2026-03-19
🟡3212.count-submatrices-with-equal-frequency-of-x-and-y
🏷️ Tags
#array #matrix #prefix_sum
🟡3212.count-submatrices-with-equal-frequency-of-x-and-y
🏷️ Tags
#array #matrix #prefix_sum
Telegraph
count-submatrices-with-equal-frequency-of-x-and-y
给你一个二维字符矩阵 grid,其中 grid[i][j] 可能是 'X'、'Y' 或 '.',返回满足以下条件的子矩阵数量:
leetcode.com 2026-03-19
🟡3212.count-submatrices-with-equal-frequency-of-x-and-y
🏷️ Tags
#array #matrix #prefix_sum
🟡3212.count-submatrices-with-equal-frequency-of-x-and-y
🏷️ Tags
#array #matrix #prefix_sum
Telegraph
count-submatrices-with-equal-frequency-of-x-and-y
Given a 2D character matrix grid, where grid[i][j] is either 'X', 'Y', or '.', return the number of submatrices that contain:
leetcode.cn 2026-03-20
🟡3567.minimum-absolute-difference-in-sliding-submatrix
🏷️ Tags
#array #matrix #sorting
🟡3567.minimum-absolute-difference-in-sliding-submatrix
🏷️ Tags
#array #matrix #sorting
Telegraph
minimum-absolute-difference-in-sliding-submatrix
给你一个 m x n 的整数矩阵 grid 和一个整数 k。 对于矩阵 grid 中的每个连续的 k x k 子矩阵,计算其中任意两个 不同值 之间的 最小绝对差 。 返回一个大小为 (m - k + 1) x (n - k + 1) 的二维数组 ans,其中 ans[i][j] 表示以 grid 中坐标 (i, j) 为左上角的子矩阵的最小绝对差。 注意:如果子矩阵中的所有元素都相同,则答案为 0。 子矩阵 (x1, y1, x2, y2) 是一个由选择矩阵中所有满足 x1 <= x <= x2 且 y1…
leetcode.com 2026-03-20
🟡3567.minimum-absolute-difference-in-sliding-submatrix
🏷️ Tags
#array #matrix #sorting
🟡3567.minimum-absolute-difference-in-sliding-submatrix
🏷️ Tags
#array #matrix #sorting
Telegraph
minimum-absolute-difference-in-sliding-submatrix
You are given an m x n integer matrix grid and an integer k. For every contiguous k x k submatrix of grid, compute the minimum absolute difference between any two distinct values within that submatrix. Return a 2D array ans of size (m - k + 1) x (n - k +…
leetcode.cn 2026-03-22
🟢1886.determine-whether-matrix-can-be-obtained-by-rotation
🏷️ Tags
#array #matrix
🟢1886.determine-whether-matrix-can-be-obtained-by-rotation
🏷️ Tags
#array #matrix
Telegraph
determine-whether-matrix-can-be-obtained-by-rotation
给你两个大小为 n x n 的二进制矩阵 mat 和 target 。现 以 90 度顺时针轮转 矩阵 mat 中的元素 若干次 ,如果能够使 mat 与 target 一致,返回 true ;否则,返回 false 。 示例 1: 输入:mat = [[0,1],[1,0]], target = [[1,0],[0,1]] 输出:true 解释:顺时针轮转 90 度一次可以使 mat 和 target 一致。 示例 2: 输入:mat = [[0,1],[1,1]], target = [[1,0]…
leetcode.com 2026-03-22
🟢1886.determine-whether-matrix-can-be-obtained-by-rotation
🏷️ Tags
#array #matrix
🟢1886.determine-whether-matrix-can-be-obtained-by-rotation
🏷️ Tags
#array #matrix
Telegraph
determine-whether-matrix-can-be-obtained-by-rotation
Given two n x n binary matrices mat and target, return true if it is possible to make mat equal to target by rotating mat in 90-degree increments, or false otherwise. Example 1: Input: mat = [[0,1],[1,0]], target = [[1,0],[0,1]] Output: true Explanation:…