Count and SayThe count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, …1 is read off as one 1 or 11.11 is read off as two 1s or 21.…

Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order. You may assume no du…

1，备份系统默认的源（没有root权限的前面加sudo）cp /etc/apt/sources.list /etc/apt/sources.list.bak2，修改/etc/apt/sources.list>/etc/apt/sources.list cat >>/etc/apt/sources.list<<EOF #…

Given an array and a value, remove all instances of that value in place and return the new length. Do not allocate extra space for another array, you must do this in place wit…

Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space for another array, you must…