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    The solution is straight-forward. We check each of the char of the String. Then concat every single char to string

    String reverseString(String s) {
    if (s == null || s.length() == 0)
    return "";
    StringBuilder ret = new StringBuilder();
    for (int i = s.length() - 1; i > -1; i --) {
    return ret.toString();

    Complexity Analysis

    The run time depends on the String in s. the time complexity is O(1)O(1).

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