We all know there are six bitwise operators in Python, and most of the other programming languages: Bitwise AND - &Bitwise OR - |Bitwise XOR - ^Bitwise Left Shift -…
给定一个 m x n 字符串矩阵,m 和 n 都大于 3。矩阵里的每一个元素都是一个字母,检查是否有相同字母在矩阵里面形成一个围城。如下图所示,字母 a 在这个 7 x 5 的矩阵里面形成了一个围城。 输入样例: grid = [["a", "a", "a", "a", "a", "b", "b"],["a", "c", "c", "c", "a", "a",…