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Try this:

// header files for TBB
#include <tbb\tbb_thread.h>
#include <tbb\blocked_range.h>
#include <tbb\parallel_for.h>
#include <tbb\parallel_reduce.h>
#include <tbb\task_scheduler_init.h>
#include <tbb\mutex.h>
#include <tbb\tbb_thread.h>
#include <tbb\blocked_range2d.h>

using namespace tbb;

// in main() function
int TBB_THREADS = 8;
task_scheduler_init init(TBB_THREADS);