Measure time (#706)

* Create measure_time_elapsed.cpp

* add functionality to measure time elapsed of a code

* cout --> std:cout

* Update measure_time_elapsed.cpp

* Update time_elapsed.cpp

* Update measure_time_elapsed.cpp

* std:cout << getTimeInMicroseconds() - starttime;

* std:cout << getTimeInMicroseconds() - starttime;

* Update measure_time_elapsed.cpp

* Fix include order and use int64

* Remove trailing whitespace

* Delete time_elapsed.cpp

* int64_t

* #include <sys/time.h>

* long long

* int64

* int64_t

* __int64_t

* std::cout and std::nullptr

* #include <iostream>
Co-authored-by: NChristian Clauss <cclauss@me.com>

others/measure_time_elapsed.cpp

+// To calculate the time taken by a code to execute
+#include <sys/time.h>
+#include <iostream>
+
+__int64_t getTimeInMicroseconds() {
+    struct timeval start;
+    gettimeofday(&start, NULL);
+    return start.tv_sec * 1000000 + start.tv_usec;
+}
+
+// write function sample(args)
+
+int main() {
+    // write code
+    __int64_t starttime = getTimeInMicroseconds();
+    // sample(args) function run
+    // Any other functions (if present) run
+    std::cout << getTimeInMicroseconds() - starttime;
+}