https://www.luogu.org/problem/P1422
#include<iostream> #include<cstdio> using namespace std; int main(void) { int a; cin>>a; if(a<=150) printf("%.1f\n", a*0.4463); else if (a>=151&&a<=400) printf("%.1f\n", a*0.4663-3); else printf("%.1f\n", a*0.5663-43); return 0; }
//(0.4663-0.4463)*150=3 //(0.5663-0.4663)*400+3=43
