描述 Write a function that takes a string as input and returns the string reversed.
Example: Given s = “hello”, return “olleh”.
分析 翻转字符串。 取字符串长度的一半进行循环，首尾交换。
代码
class Solution {
public:
string reverseString(
string s) {
const int n = s.size();
for (size_t i =
0; i < n /
2; ++i) {
swap (s[i], s[n - i -
1]);
}
return s;
}
};
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