mirror of
https://github.com/wczffl-503/OI-Codes.git
synced 2025-05-10 16:20:27 +08:00
23 lines
372 B
C++
23 lines
372 B
C++
#include <iostream>
|
|
#include <cmath>
|
|
#include <cstdlib>
|
|
#include <cstdio>
|
|
#include <iomanip>
|
|
using namespace std;
|
|
int main(){
|
|
double a;
|
|
cin >>a;
|
|
if(0<=a && a<5){
|
|
cout <<fixed<<setprecision(3)<<(0-a)+2.5;
|
|
}
|
|
if(5<=a && a<10){
|
|
cout <<fixed<<setprecision(3)<<2-1.5*(a-3.0)*(a-3.0);
|
|
}
|
|
if(10<=a && a<20){
|
|
cout <<fixed<<setprecision(3)<<a/2.0-1.5;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|