https://www.acgo.cn/application/1680173891275513856

#include<iostream> using namespace std; int main(){ int k; cin>>k; }

#include<iostream> using namespace std; void mx(int a,int b,int c){ int x = a; if(b>x)x=b; if(c>x)x=c; cout<<x; } int main(){ int a,b,c; cin>>a>>b>>c; mx(a,b,c); returnn 0; }

#include<iostream> #include<cmath> using namespace std; int main(){int a,b,s=0; cin>>a>>b; for(int i=a;i<=b;++i){int x=2; while(x<=floor(sqrt(i))&&(i%x!=0))++x; if(x>floor(sqrt(i)))s+=1;} cout<<s; return 0;}