蓝桥杯 练习系统 基础练习答案Java

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1、30importjava.math.BigInteger;importjava.util.*;publicclassMain{protectedstaticArrayListtable=newArrayList();static{table.add(BigInteger.valueOf(1));}publicstaticsynchronizedBigIntegerfactorial(intx){for(intsize=table.size();size<=x;size++){BigIntegerlastfact=(BigInteger)table.get(size-1);Bi

2、gIntegernextfact=lastfact.multiply(BigInteger.valueOf(size));table.add(nextfact);}return(BigInteger)table.get(x);}publicstaticvoidmain(String[]args){Scanners=newScanner(System.in);intn=s.nextInt();System.out.print(factorial(n));}}29importjava.io.BufferedReader;importjava.io.IOException;impo

3、rtjava.io.InputStreamReader;publicclassMain{publicstaticvoidmain(String[]args)throwsNumberFormatException,IOException{BufferedReaderbr=newBufferedReader(newInputStreamReader(System.in));Strings1=br.readLine();Strings2=br.readLine();inta[]=newint[100000];intb[]=newint[100000];intl1=s1.length

4、();intl2=s2.length();for(inti=0;il2?l1:l2;intc[]=newint[100000];for(inti=0;i9){c[i+1]+=c[i]

5、/10;c[i]=c[i]%10;}}while(c[max-1]>9){c[max]=c[max-1]/10;c[max-1]=c[max-1]%10;max++;}for(inti=max-1;i>=0;i--){System.out.print(c[i]);}}}28importjava.io.*;importjava.math.BigInteger;publicclassMain{publicstaticvoidmain(String[]args)throwsIOException{BufferedReaderbuf=newBufferedReader(newInpu

6、tStreamReader(System.in));intn=Integer.parseInt(buf.readLine());Stringstr=buf.readLine();Strings[]=str.split("");intsum=0;inta[]=newint[n];intnum=0;for(inti=0;i1){sum=a[0]+a[1];num=sum;a[1]=num;for(intj=2;j

7、.util.Arrays.sort(a);num=a[j-1]+a[j];a[j]=num;java.util.Arrays.sort(a);sum+=num;}}}else{sum=a[0];}System.out.println(sum);}}27importjava.util.Scanner;publicclassMain{publicstaticintn=0;publicstaticinta[]=newint[10];publicstaticintisa[][]=newint[10][10];p