rt

先贴代码

#include<bits/stdc++.h>
#define ll  long long 
using namespace std;
int main(){
	int t;
	cin>>t;
	ll a;
	cout<<fixed;
	cout << setprecision(0);
	while(t--){
		cin>>a;
		if(a==0){
			cout<<0<<endl;
			 continue;
		}
		if(a<=6){
			cout<<15<<endl; 
			continue;
		}
		if(a<=8){
			cout<<20<<endl;
			continue;
		}
		if(a<=10){
			cout<<25<<endl;
			continue;
		}
		if(a%2==0) {
			cout<<a*2.5<<endl;
		}
		else{
			cout<<(a-5)*2.5+15<<endl;
		}
	} 
	return 0;
}