Why Codechef online IDE is showing 'Time Limit Exceeded' but same solution is accepted when submitted?

general
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1

When i compile and run a C program in my Dev C++ IDE it is giving right execution time. And I submitted the code for a practice problem. The Answer was Accepted. But just to see how Codechef Online IDE works, I run the same code. But I shows more execution time and time limit exceeded.

So Can anyone please explain why this is happening?

2

This sometimes happens if i don’t insert any test cases in the online IDE. Like a program to take two inputs to add and if no input is given the program may simply wait for input.

3

If they don’t add test cases to IDE then what is the use of their Online IDE. I can’t understand.