0344. Reverse String

344. Reverse String #

题目 #

Write a function that reverses a string. The input string is given as an array of characters char[].

Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

You may assume all the characters consist of printable ascii characters.

Example 1:


Input: ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]

Example 2:


Input: ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]

题目大意 #

题目要求我们反转一个字符串。

解题思路 #

这一题的解题思路是用 2 个指针,指针对撞的思路,来不断交换首尾元素,即可。

代码 #


package leetcode

func reverseString(s []byte) {
	for i, j := 0, len(s)-1; i < j; {
		s[i], s[j] = s[j], s[i]
		i++
		j--
	}
}


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