OpenMP Version(N=25000, M=25000, Threads=1): t= 1170.268281 ms
OpenMP Version(N=25000, M=25000, Threads=2): t= 462.748051 ms
OpenMP Version(N=25000, M=25000, Threads=5): t= 233.253169 ms
OpenMP Version(N=25000, M=25000, Threads=10): t= 180.470340 ms
OpenMP Version(N=25000, M=25000, Threads=20): t= 189.864190 ms
OpenMP Version(N=25000, M=25000, Threads=40): t= 186.259170 ms