Write a function that reverses a string. The input string is given as an array of characters char[].
Detail instruction can be found here.
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"]
public void reverseString(char[] s) {
int n = s.length;
for (int i = 0; i < n / 2; i++) {
exch(s, i, n - i - 1);
}
}
private helper methods
private void exch(char[] s, int i, int j) {
char c = s[i];
s[i] = s[j];
s[j] = c;
}
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