CNoodle

摘要： Given an array nums of integers, return the length of the longest arithmetic subsequence in nums. Note that: A subsequence is an array that can be der 阅读全文

摘要： Given an m x n binary matrix mat, return the number of special positions in mat. A position (i, j) is called special if mat[i][j] == 1 and all other e 阅读全文