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这个样子竟然会超时?#include <iostream>
#include <cstdio>
#include <algorithm>
#define ll long long
using namespace std;
int prim[200000]={2,3,5};
int k =3;
void is_prim()
{
int i, j;
int flag, step = 2;
for(i=7;i<=1000000;i+=step)
{
step = 6-step;
flag = 1;
for(j=0;prim[j]*prim[j]<=i;j++)
if(i%prim[j] == 0){
flag = 0;
break;
}
if(flag)
prim[k++] = i;
}
}
int main()
{
int L, U;
int i, ans1, ans2, j;
is_prim();
while(scanf("%d %d",&L,&U),L!=-1||U!=-1){
ans1 = ans2 = 0;
for(i=0;L>prim[i];i++);
for(j=i;prim[j]<=U;j++)
{
printf("%d \n",prim[j]);
if((prim[j]-1)%4 == 0|| prim[j]==2)
ans2++;
ans1++;
}
printf("%d %d %d %d\n",L,U,ans1,ans2);
}
return 0;
}
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