Test problem

Problem is so simple, but I
am getting TLE ( test case 4 ) every time when I submit my code.

The problem is indeed really simple. But it is still well designed, to make you think of all the cases.

The problem does not say that there will always be number 42! What if you reach the end of the file and still try to read numbers. then your scanf will wait forever!

Some people complained that the problem is too easy, but I'll keep it since, obviously some people didn't think of all the cases, and didn't solve it.

But how I know when it is end of file?
Text says that input is read from the standard input, not from file.

In pascal Keyboard is a "file". Probeably in C++ too. Just use EOF.

standard input can also be considered as a file.

Can you please look at my last submission?
What is wrong ?
I cannot understand.

I don't know about cin.eof(), but i used the fact that (cin >> a) returns false whet it reads EOF, and true otherwise.

So, this worked:

while (cin>>a && a!=42) { cout << a << endl; }

Here is the solution in Pascal.

Program TestProblem;
Var
Ans:Integer;
Begin
While Not EOF Do
Begin
ReadLn(Ans);
If ( Ans = 42 ) Then Halt
Else WriteLn(Ans);
End;
End.


This is how you use keyboard as a file. ;)

This is too a solution:
while( scanf("%d",&p)!=EOF)

You can write it in C++ using eof:

while(!cin.eof())
{
cin >> a;
}

Or just while( scanf( "%d", &p ) == 1 ){}

scanf() returns number of successfully inputed parameters.