Tyvj 1921 Freda的烦恼

我就不说是CF hot days 原题了，我会告诉你使用Math库是因为一开始偷懒不想写Min函数么-

 1 Uses math;
 2 Var n,m,i,t,tt,x,cost,ans,tmp:qword;
 3 Function min(x,y:qword):qword;
 4 Begin
 5   if x>y then exit(y);
 6   exit(x);
 7 end;
 8 Begin
 9    readln(n,m);
10    while (n<>0) do
11    Begin
12      dec(n);
13      readln(t,tt,x,cost);
14      if (tt<=t) then
15      begin
16        ans:=ans+cost;
17        continue;
18      end;
19      if (m mod (tt-t)=0) then tmp:=cost*trunc((m/(tt-t)))
20      else tmp:=cost*trunc((m/(tt-t)+1));
21      ans:=ans+min(m*x+cost,tmp);
22    end;
23    writeln(ans);
24 end.

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