calculating execution time in c++

Question

I have written a c++ program , I want to know how to calculate the time taken for execution so I won\'t exceed the time limit.

#include

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Answer 1

With C++11 for measuring the execution time of a piece of code, we can use the now() function:

auto start = chrono::steady_clock::now();

//  Insert the code that will be timed

auto end = chrono::steady_clock::now();

// Store the time difference between start and end
auto diff = end - start;

If you want to print the time difference between start and end in the above code, you could use:

cout << chrono::duration  (diff).count() << " ms" << endl;

If you prefer to use nanoseconds, you will use:

cout << chrono::duration  (diff).count() << " ns" << endl;

The value of the diff variable can be also truncated to an integer value, for example, if you want the result expressed as:

diff_sec = chrono::duration_cast(diff);
cout << diff_sec.count() << endl;

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