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day-65.cpp
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day-65.cpp
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/*
Reverse String
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"]
*/
// O(len(str)) & O(1) beats 82% of cpp solutions
class Solution {
public:
void reverseString(vector<char>& s) {
int len = s.size();
for (int i = 0; i < len / 2; i++) {
char ch = s[i];
s[i] = s[len - i - 1];
s[len - i - 1] = ch;
}
}
};