Code Hunt 题解 00-04 （Java）

最近做了做微软的编程小游戏 Code Hunt，这是一个给你输入输出，让你反推程序代码，同时会根据你的代码精炼程度打分的小游戏。

强迫症同学们请小心哦~

链接：https://www.codehunt.com

作为一个java新手，最近刷这个刷了半天~ 给大家贴个题解（网上的怎么都是C#版本的）

(嗯，00-08中的好多都来自于网络。。。后面的就是自己做的了）



Sector 00 Training

00.02
public class Program {
public static int Puzzle(int x) {
return x+1;
}
}

00.03
public class Program {
public static int Puzzle(int x) {
return x*2;
}
}

00.04
public class Program {
public static int Puzzle(int x, int y) {
return x+y;
}
}

Sector 01 Arithmetic

01.01
public class Program {
public static int Puzzle(int x) {
return -x;
}
}

01.02
public class Program {
public static int Puzzle(int x) {
return x-2;
}
}

01.03
public class Program {
public static int Puzzle(int x) {
return x*x;
}
}

01.04
public class Program {
public static int Puzzle(int x) {
return x*3;
}
}

01.05
public class Program {
public static int Puzzle(int x) {
return x/3;
}
}

01.06
public class Program {
public static int Puzzle(int x) {
return 4/x;
}
}

01.07
public class Program {
public static int Puzzle(int x, int y) {
return x-y;
}
}

01.08
public class Program {
public static int Puzzle(int x, int y) {
return x+2*y;
}
}

01.09
public class Program {
public static int Puzzle(int x, int y) {
return x*y;
}
}

01.10
public class Program {
public static int Puzzle(int x, int y) {
return x+y/3;
}
}

01.11
public class Program {
public static int Puzzle(int x, int y) {
return x/y;
}
}

01.12
public class Program {
public static int Puzzle(int x) {
return x%3;
}
}

01.13
public class Program {
public static int Puzzle(int x) {
return x%3+1;
}
}

01.14
public class Program {
public static int Puzzle(int x) {
return 10%x;
}
}

01.15
public class Program {
public static int Puzzle(int x, int y, int z) {
return (x+y+z)/3;
}
}

Sector 02 Loops

02.01
public class Program {
public static int[] Puzzle(int n) {
int[]puzzle=new int
;
for (int i=0;i<n;i++) puzzle[i]=i;
return puzzle;
}
}

02.02
public class Program {
public static int[] Puzzle(int n) {
int[]puzzle=new int
;
for (int i=0;i<n;i++) puzzle[i]=i*n;
return puzzle;
}
}

02.03
public class Program {
public static int[] Puzzle(int n) {
int[] puzzle=new int
;
for (int i=0;i<n;i++) puzzle[i]=i*i;
return puzzle;
}
}

02.04
public class Program {
public static int Puzzle(int[] v) {
int sum=0;
for (int i=0;i<v.length;i++) sum+=v[i];
return sum;
}
}

02.05 <必须直接写公式才有三星>
public class Program {
public static int Puzzle(int n) {
return (n*(n-1)*(2*n-1))/6;
}
}

02.06 <这题非常迷。。。replace()方法以后会常用>
public class Program {
public static int Puzzle(String s) {
String s2=s.replace("a","");
return s.length()-s2.length();
}
}

02.07
public class Program {
public static int Puzzle(String s, char x) {
String s1=s.replace(x+"","");
return s.length()-s1.length();
}
}

Sector 03 Loops 2

03.01 <写成递归才有三星>
public class Program {
public static int Puzzle(int number, int power) {
return power<=0?   1:Puzzle(number,power-1)*number;
}
}

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: upperBound*Puzzle(lowerBound,upperBound-1);
}
}

03.04 <神奇的整除>
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 <replaceAll()方法用到正则表达式！这题是照抄网上大神们的。。。。还有trim()方法会常用>
public class Program {
public static String Puzzle(String word) {
return word.replaceAll("[a-z]","_ ").trim();
}
}

03.07
public class Program {
public static String Puzzle(String s) {
int m = 5;
char[] c = new char[s.length()];
for (int i=0;i<s.length();i++)
{
c[i]=(char)((s.charAt(i)-'a'+m)%26+'a');
}
return new String(c);
}
}

03.08
public class Program {
public static int Puzzle(int x) {
return (int)(Math.log10(x))+1;
}
}

Sector 04 Conditionals

04.01
public class Program {
public static Boolean Puzzle(Boolean x, Boolean y) {
return x || y;
}
}

04.02
public class Program {
public static Boolean Puzzle(Boolean x, Boolean y) {
return x && y;
}
}

04.03
public class Program {
public static Boolean Puzzle(int x) {
return (x<50);
}
}

04.04
public class Program {
public static Boolean Puzzle(int x, int y) {
return x<y;
}
}

04.05
public class Program {
public static int Puzzle(int i) {
return (int)(Math.signum(i));
}
}

04.06
public class Program {
public static Boolean Puzzle(int i, int j) {
return i>j;
}
}

04.07
public class Program {
public static int Puzzle(int i) {
return i<100? 2:3;
}
}

04.08
public class Program {
public static String Puzzle(int i) {
return i%2==0? "even": "odd";
}
}

04.09
public class Program {
public static String Puzzle(int i) {
return i%5==0?"multiple of 5":"not a multiple of 5";
}
}

04.10
public class Program {
public static String Puzzle(int i, int x) {
return i%x==0? "multiple of " + x : "not a multiple of " + x;
}
}

04.11
public class Program {
public static String Puzzle(int i, int j, int k) {
if (j==2*k && i==2*j) return("yes!");
return ("no");
}
}

04.12 <多试几次就出来了>
public class Program {
public static int Puzzle(int i) {
return i>14? 21: i>7? 7:0;
}
}