hdu 4715 Difference Between Primes
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题目连接:http://acm.hdu.edu.cn/showproblem.php?pid=4715
#include<stdio.h>#include<math.h>#include<string.h>int num[580000];bool prime[7000000];int main(){ int N,i,j,k; memset(prime,true,sizeof(prime)); prime[0]=prime[1]=false; for(i=2;i<=sqrt(7000000);i++){//帅选法 if(prime[i]){ for(int j=2*i;j<7000000;j+=i) prime[j]=false; } } k=0; for(i=0;i<7000000;i++) if(prime[i]) num[k++]=i; int T; scanf("%d",&T); while(T--) { int n; scanf("%d",&n); if(n==0) printf("2 2\n"); if(n<0) N=-n; else N=n; int flag=0; for(i=0;i<k;i++) if(prime[num[i]+N]){ flag=1; if(n>0) printf("%d %d\n",num[i]+N,num[i]); if(n<0) printf("%d %d\n",num[i],num[i]+N); break; } if(flag==0) printf("FAIL\n"); } return 0;}
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