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I am calculating the right answers. But how do I terminate the program?

What I have done is, the program keeps looping until there is input, and terminates when something like ctrl-c is pressed. Is this fine?

I am doing this, because we dont know how many times the program should loop. I usually ...

Can someone please explain how problem 100 should be constructed? Please tell me the type of inputs and type of outputs.

For instance, in my program given below, I keep accepting input until there's no input, with "while(cin>>first>>last)".

Should my program work for specific type of input? if so ...

I am having problems with the same. I dont even know whats wrong with my code.

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[cpp]// @BEGIN_OF_SOURCE_CODE
/* @JUDGE_ID: xxxxxx 100 C++ */

#include <iostream>
#include <stdlib.h>
#include ...