编写一个函数,其作用是将输入的字符串反转过来。输入字符串以字符数组 char[] 的形式给出。
不要给另外的数组分配额外的空间,你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。
你可以假设数组中的所有字符都是 ASCII 码表中的可打印字符。
示例 1:
输入:["h","e","l","l","o"]
输出:["o","l","l","e","h"]
示例 2:
输入:["H","a","n","n","a","h"]
输出:["h","a","n","n","a","H"]
解法:
func reverseString(_ s: inout [Character]) {
// s.reverse()
guard !s.isEmpty else {
return
}
var j = s.count-1;
var i = 0;
var temp: Character;
while(i < j){ //类似冒泡
temp = s[i];
s[i] = s[j];
s[j] = temp;
i += 1;
j -= 1;
}
}
来源:CSDN
作者:huanglinxiao
链接:https://blog.csdn.net/huanglinxiao/article/details/92959535