摘要：
There are some chips, and the i-th chip is at position chips[i]. You can perform any of the two following types of moves any number of times (possibly 阅读全文
摘要：
Given an integer array arr and an integer difference, return the length of the longest subsequence in arr which is an arithmetic sequence such that th 阅读全文
摘要：
In a gold mine grid of size m * n, each cell in this mine has an integer representing the amount of gold in that cell, 0 if it is empty. Return the ma 阅读全文