LeetCode題解：Reverse String
Write a function that takes a string as input and returns the string reversed.
Example:
Given s = "hello", return "olleh".
思路：
當然可以用雙指標來做，不過最簡單的還使用STL。
題解：
std::string reverseString(std::string s) { std::string result; std::copy(s.rbegin(), s.rend(), std::back_inserter(result)); return result; }
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