Abstract The problem requires sorting all cells of a given matrix in ascending order of their Manhattan distances to the center point (rCenter, cCenter). The solution is to iterate through all cells,

Abstract: This problem requires determining whether each prefix of a binary array is divisible by 5. By progressively calculating the remainder modulo 5 of each prefix, the problem of excessively larg

This problem requires finding the smallest number composed only of digit '1' that is divisible by a given integer k. The solution leverages modular arithmetic to efficiently compute remainders without

Abstract:This paper explores the pyramid transformation matrix problem, which requires determining whether a complete pyramid can be constructed given a bottom block and allowed triangle pattern rules

Summary: The problem involves counting distinct phone numbers of length n where each digit transition follows the chess knight's move pattern on a phone pad. The solution uses dynamic programming (DP)

Abstract The problem asks to find a pair of attractions (i, j) in a given array of tourist attractions that maximizes the rating values[i] + values[j] + i - j. By splitting the formula into (values[i]

Summary: The problem involves a game where Alice and Bob take turns removing numbers from a chalkboard, with Alice starting first. A player loses if their move makes the XOR of all remaining numbers z

Summary: The problem models a Cat and Mouse game on an undirected graph where players alternate moves. The mouse starts at node 1, the cat at node 2, and the hole is at node 0. The game ends if the ca

Given the coordinates of four points in 2D space p1, p2, p3 and p4, return true if the four points construct a square.The coordinate of a point pip_ipi​ is represented as [xi,yi][x_i, y_i][xi​,yi​]. T

Summary: The problem requires counting pairs of songs whose total duration is divisible by 60. The solution leverages modular arithmetic to simplify the problem. For each song duration, we compute its