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#include <stdio.h>
#include <stdlib.h>
...
    print_counter(&count);
    printf("\n");
}

$ time ./pc 6 6
the number of patterns is: 000000000000000000000000000000000000000009d
+b3f0a5d231378f10a55ce
...
user    139m29.330s
sys    0m7.910s