京东2016年校招笔试题

本文主要是介绍京东2016年校招笔试题，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、空格替换问题

要求将空格替换为指定的字符串，在原数组的基础上面替换。

import java.util.Scanner;public class Main {public static char[] replaceString(char[] str,int oldlen,char[] replaces){int j = str.length-1;for (int i = oldlen-1; i >= 0; i--) {if (str[i]!=' ') {str[j] = str[i];j--;}else {for (int k = replaces.length-1; k >= 0 ; k--) {str[j] = replaces[k];j--;}}   }return str;}public static void replace(String str, String replace){if (str==null) {return;}if(str.length()==0||str.length()>50){return;}if (replace==null) {return;}if(replace.length()==0||replace.length()>10){return ;}char[] replaces = replace.toCharArray();String[] strs = str.split(" +");//System.out.println(strs.length);//原始长度-空格数+替换长度*空格数char result[] = new char[str.length()-(strs.length-1)+(strs.length-1)*replaces.length];System.arraycopy(str.toCharArray(), 0, result, 0, str.length());replaceString(result,str.length(),replaces);for (int i = 0; i < result.length; i++) {System.out.print(result[i]);}}public static void main(String[] args) {Scanner cin = new Scanner(System.in);while(cin.hasNext()){String str, replace;str = cin.nextLine();replace = cin.nextLine();//System.out.println(str+" "+replace);replace(str,replace);}//System.out.println(replaceString("You are the best".toCharArray(),16,"123".toCharArray()));//System.out.println(replaceString("a b c d","abcd"));}
}

2、跳楼梯问题

每次只能跳一格或者两格，从第一个格跳起走，即当只有一个梯子时，为0。

import java.util.Scanner;public class Main {public static int kip(int m){int sum=0;if (m==1) {return sum;}if (m==2) {return 1;}if (m==3) {return 2;}int first = 1;int secord = 2;for (int i = 4; i <= m; i++) {sum = first+secord;first = secord;secord = sum;}return sum;}public static void main(String[] args) {Scanner cin = new Scanner(System.in);int num = cin.nextInt();for (int i = 0; i < num; i++) {int m  = cin.nextInt();System.out.println(kip(m));if (num-1==i) {break;}}}
}

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