蓝桥杯练习系统算法训练问题详解Java.doc

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1、实用文档ALGO-9importjava.io.*;publicclassMain{publicstaticvoidmain(Stringargs[])throwsIOException{BufferedReaderbf=newBufferedReader(newInputStreamReader(System.in));intn=Integer.parseInt(bf.readLine());System.out.println((int)(Math.pow(2,n)-n-1)*2);}}10importjava.io.*;importjav

2、a.util.Arrays;importjava.util.HashSet;importjava.util.Iterator;importjava.util.Set;publicclassMain{publicstaticvoidmain(String[]args)throwsIOException{BufferedReaderbr=newBufferedReader(newInputStreamReader(System.in));intn=Integer.parseInt(br.readLine());实用文档int[]arr=newint

3、[n];Stringst[]=br.readLine().split("");for(inta=0;a

4、ys.sort(tag);func(arr,tag);}publicstaticvoidfunc(int[]arr,int[]tag){intx;for(inta=0;a=0){System.out.print(arr[a]+"");}}System.out.println();Setset=newHashSet();for(inta=0;a

5、arr[a]);}for(inta=0;ait=set.iterator();while(it.hasNext()){for(inta=0;a

6、.println();inty;for(inta=0;a

7、);if(1<=n&&n<=10){if(n==1){System.out.println("1");}else{int[]tag=newint[n];tag[0]=1;tag[1]=2;if(n==1){System.out.println(tag[0]);}for(inta=2;a

8、r;publicclassMain{publicstaticvoidmain(String[]args)throwsException{Buffere