I've try several way to submit my solution,but it always show time exceed.I don't known why,can you help me?


  • 0
    A

    public String reverseString(String str) {
    String result = "";
    int temp = str.length() - 1;
    while(temp >= 0)
    {
    result += str.charAt(temp--);
    }
    return result;


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