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  1. #include<cstdio>
  2. bool arr[2000001];
  3. int main()
  4. {
  5.     arr[0]=arr[1]=1;
  6.     for(int i=4;i<2000001;i+=2)
  7.         arr[i]=1;
  8.     for(int i=3;i*i<2000001;i+=2)
  9.     {
  10.         if(!arr[i])
  11.             for(int j=2;i*j<2000001;j++)
  12.             {
  13.                 arr[i*j]=1;
  14.             }
  15.     }
  16.     int n,t;
  17.     scanf("%d",&t);
  18.     while(t--)
  19.     {
  20.         long long sum=0;
  21.         scanf("%d",&n);
  22.         for(int i=0;i<=n;i++)
  23.         {
  24.             if(!arr[i])
  25.             {
  26.                 //printf("%d\n",i);
  27.                 sum+=i;
  28.             }
  29.         }
  30.         printf("%lld\n",sum);
  31.     }
  32.     return 0;
  33. }
Success #stdin #stdout 0.02s 4852KB
comments (?)
stdin
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2
10
2000000
stdout
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17
142913828922
https://ideone.com/ozS0QZ
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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