與正確輸出不相符(line:515)
您的答案為: 167
正確答案為: 168 

#include <stdio.h>



int main (void)

{
    int a,b;
    int q;
    int w,final,is;
   
    while(scanf("%d %d",&a,&b)!=EOF)
    {
                    final=0;
                   
                    for(q=a; q<=b; q++)
                    {
                             if(q==0) {continue;}
                             for(w=2; w<=sqrt(q); w++)
                             {
                                      if(q%w==0) {is=0; break;}
                                      else {is=1;}
                                      }if(w>sqrt(q)&&is==1 || a==b || q==3) {final++;}

                             }
         
          printf("%d\n",final);
                                
                                 }
                                

return 0;
}



 

WA (line:515)
答案不正確

您的答案為: 169 正確答案為: 168 

我也是同一測資，囧

#include<iostream>
#include<cmath>
using namespace std;

int Q(int a)
{
    int i,x=sqrt(a)+1,xx=1;
    for(i=2;i<x;i++)
        if(a%i==0)
        {
            xx=0;
            break;
        }
    return xx;
}

main()
{
    int a,b,i,ans;
    while(cin >> a >> b)
    {
        ans=0;
        for(i=a;i<b+1;i++)
            ans+=Q(i);
        cout << ans <<endl;
    }
}