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????? Offer 58 - II. ??????

???????????????????????????????????????????????????????"abcdefg"???2???????????????"cdefgab"?

?? 1? ???s = "abcdefg", k = 2 ???"cdefgab"

?? 2? ???s = "lrloseumgh", k = 6 ???"umghlrlose"

????? 1 ? k < s.length ? 10000

???Java?? ??substring?????????????????????

Java?????

public class Solution {
    public String reverseLeftWords(String s, int n) {
        if (n == 0) {
            return s;
        }
        String s1 = s.substring(0, n);
        String s2 = s.substring(n);
        return s2 + s1;
    }
}

???

• ??n?0???????????
• ??substring(0, n)???n????
• ??substring(n)???n?????????
• ???????????????????????