code hunt 题解四（java 版）

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03.01 这个貌似要写成递归才会有3星

public class Program {    public static int Puzzle(int number, int power) {          return power<=0 ? 1 : number*Puzzle(number, power-1);    }}

03.02

public class Program {    public static int Puzzle(int i) {        return i == 0?1:i*Puzzle(i-1);    }}

03.03

public class Program {    public static int Puzzle(int lowerBound, int upperBound) {        return lowerBound>upperBound? 1 :lowerBound*Puzzle(lowerBound+1, upperBound);    }}

03.04

public class Program {    public static int Puzzle(int n) {        if (n <= 2) {            return 0;        }        return ((n-1)/2)*((n-1)/2+1);    }}

03.05

public class Program {    public static int Puzzle(int upperBound) {        return (upperBound)*(upperBound+1)*(upperBound+2)/6;    }}

03.06

public class Program {    public static String Puzzle(String word) {        return word.replaceAll("[a-z]", "_ ").trim();    }}

03.07 凯撒密码

public class Program {    public static String Puzzle(String s) {        char[] c = s.toCharArray();        for (int i = 0; i < s.length(); i++) {            c[i] = (char)((c[i]-'a'+5)%26 + 'a');        }        return new String(c);    }}

03.08

public class Program {    public static int Puzzle(int x) {        return (x+"").length();    }}

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