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## Discussion of Problem 1091. Tmutarakan Exams

Accepted Java
Posted by magzhan 22 Jun 2011 22:14

import java.math.BigInteger;
import java.util.*;

public class Problem {

public static BigInteger c(int n, int k){
BigInteger r=BigInteger.ONE;
for(int i=0;i<k;i++){
r=r.multiply(BigInteger.valueOf(n-i));
}
for(int i=0;i<k;i++){
r=r.divide(BigInteger.valueOf(i+1));
}
return r;
}

public static boolean inP(int x, int[] p){
for(int i=0;i<p.length;i++){
if(p[i]==x)
return true;
}
return false;
}

public static void main (String[] args) {
try {

Scanner in = new Scanner(System.in);

int k=in.nextInt();
int s=in.nextInt();

int[] p = new int[9];
boolean[] b = new boolean[s+1];

BigInteger q = BigInteger.ZERO;

p[0]=2;p[1]=3;p[2]=5;
p[3]=7;p[4]=11;p[5]=13;
p[6]=17;p[7]=19;p[8]=23;

int x=0,y=0;
int[] w = new int[s+1];
for(int i=0;i<9;i++){
x=0;y=s/p[i];
for(int j=2;j<=s;j++){
if(j%p[i]==0){
if(b[j]){
for(int o=2;o<=j;o++){
if(j%o==0 && o<p[i] && inP(o,p)){
w[o]++;
}
}
}
b[j]=true;
}
}
if(y>=k){
}
for(int j=0;j<s+1;j++){
if(w[j]>=k){
q=q.subtract(c(w[j],k));
}
}
w=new int[s+1];

}

if(Integer.parseInt(q.toString())<=10000){
System.out.println(q);
}else{
System.out.println(10000);
}

} catch (Exception ex) {

System.out.println(ex.toString());
}
}
}
Re: Accepted Java
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