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giai thuat moi de tim day so nguyen to theo tu tuong cua Eratosthene  Empty giai thuat moi de tim day so nguyen to theo tu tuong cua Eratosthene

Post  Admin Thu Jun 09, 2011 3:00 am

#include <conio.h>
#include <iostream.h>
#include <math.h>
void snt(int n){
int kt[1000];
kt[1]=0;
for(int i=2;i<=n;i++) kt[i]=1; //khoi tao kiem tra
int j; i=1;
while (i<=sqrt(n)){
while(kt[i+1]==0) i++;
i++;
for(j=i+1;j<=n;j++) if(j%i==0) kt[j]=0;
}
cout<<"\n";
for(i=2; i<=n;i++) if(kt[i]==1) cout<<i<<" "; //hien thi

}
void main(){
int n;
cout<<"\nn="; cin>>n;
snt(n);
getch();
}
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