Execution Time Info!

general
1

How to know the execution time of my program ?

2
  • Execution time is displayed just below green tick(AC) which you see when your code is correct.
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3

i am using dev c++,so can’t it be calculated there??

4

Try codeblocks. However you may use clock() function in <time.h> to calculate time elapsed in executing a block of code.

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@wonder >> I would give an example for what @bit_cracker007 mentioned.

You can insert this code snippet before input.

#ifndef ONLINE_JUDGE
    time_t start = clock();
#endif

and then you can write this at the end of printing output

#ifndef ONLINE_JUDGE
	time_t end = clock();
	printf("Time: %.2lf sec\n", (end-start)/double(CLOCKS_PER_SEC));
#endif

Then you should run the program with redirecting an input test file (assuming that you have created it beforehand), and then you can observe the output at the screen itself OR you can redirect output to some file if the number of test cases is huge!

For example:

wonder@ubuntu:~$ gcc -o sample sample.c
wonder@ubuntu:~$ ./sample < testinput.in > testoutput.out

Or you can also use the C function freopen() in the corresponding mode (r or w) for the corresponding task. Example:

#ifndef ONLINE_JUDGE
    freopen("abc.in","r",stdin);
#endif

Note: You must have to include the header ctime in C++ (time.h in C) for using the clock() and time_t

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