#include <omp.h>#include <stdlib.h>intmain (void){int i = -1, j = -1;omp_set_nested (1);omp_set_dynamic (0);#pragma omp parallel num_threads (4){#pragma omp single{i = omp_get_thread_num () + omp_get_num_threads () * 256;#pragma omp parallel num_threads (2){#pragma omp single{j = omp_get_thread_num () + omp_get_num_threads () * 256;}}}}if (i < 4 * 256 || i >= 4 * 256 + 4)abort ();if (j < 2 * 256 || j >= 2 * 256 + 2)abort ();return 0;}