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- #include <bits/stdc++.h>
- using namespace std;
- typedef long long ll;
- ll primo[1000000];
- ll vetor[1000000];
- int main() {
- //freopen("in.txt", "r", stdin);
- //freopen("out.txt", "w", stdout);
- //fazendo crivo
- for(ll i = 2;i<=1000000;i++){
- primo[i]=1;
- }
- for(ll i = 2;i<=1000000;i++){
- if(primo[i]){
- for(ll j = 2*i;j<=1000000;j+=i){
- primo[j] = 0;
- }
- }
- }
- int aux = 0;
- for(ll i = 0;i<=1000000;i++){
- if(primo[i]) aux++;
- vetor[i] = aux;
- }
- int t;
- ll auxiliar, a, b, s = 0;
- cin>>t;
- while(t>0){
- auxiliar = 0;
- cin>>a>>b;
- s = 0;
- a = sqrt(a-1);
- b = sqrt(b);
- s = vetor[b]-vetor[a];
- cout<<s<<"\n";
- t--;
- }
- }
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