Java采用”2的补码“(Two's Complement)编码负数，它是一种数值的编码方法，要分二步完成：第一步，每一个二进制位都取相反值，0变成1，1变成0。比如，+8的二进制编码是00001000，取反后就是11110111。第二步，将上一步得到的值加1。11110111就变成11111000。所以，00001000的2的补码就是11111000。也就是说，-8在计算机（...

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)

There are two sorted arrays a and a of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).

Algorithms Fourth EditionWritten By Robert Sedgewick & Kevin WayneTranslated By 谢路云