Reverse String (E)
題目
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"]
題意
將一個字符陣列逆置，
思路
Two Pointers，
代碼實作
Java
class Solution {
public void reverseString(char[] s) {
int i = 0, j = s.length - 1;
while (i < j) {
char tmp = s[i];
s[i++] = s[j];
s[j--] = tmp;
}
}
}
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