剑指 Offer 58 - II. 左旋转字符串

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方案一: 旋转 = 反转

var reverseLeftWords = function (s, n) {
    /** Utils */
    function reverseWords(strArr, start, end) {
        let temp;
        while (start < end) {
            temp = strArr[start];
            strArr[start] = strArr[end];
            strArr[end] = temp;
            start++;
            end--;
        }
    }
    /** Main code */
    let strArr = s.split('');
    let length = strArr.length;
    reverseWords(strArr, 0, length - 1);
    reverseWords(strArr, 0, length - n - 1);
    reverseWords(strArr, length - n, length - 1);
    return strArr.join('');
};