2021-02-05: given a number N, imagined by the 0 s and 1 s only two kinds of characters, all of string of length N, if a string, any characters to the left of the 0 1 next to, think this string to amount to mark, could you tell me how many standard string? # # f greatly architects a daily topic

CodePudding user response:

This is a triangle function?

CodePudding user response:

To determine whether a string of 1 the beginning, and does not contain "00" is ok;