john@e6510:~/Desktop$ ./ranges -N=1 -M=9999997
 0 : from       0 to 9999997 (9999998)
john@e6510:~/Desktop$ ./ranges -N=2 -M=9999997
 0 : from       0 to 4999998 (4999999)
 1 : from 4999999 to 9999997 (4999999)
john@e6510:~/Desktop$ ./ranges -N=3 -M=9999997
 0 : from       0 to 3333332 (3333333)
 1 : from 3333333 to 6666665 (3333333)
 2 : from 6666666 to 9999997 (3333332)
john@e6510:~/Desktop$ ./ranges -N=4 -M=9999997
 0 : from       0 to 2499999 (2500000)
 1 : from 2500000 to 4999999 (2500000)
 2 : from 5000000 to 7499999 (2500000)
 3 : from 7500000 to 9999997 (2499998)
john@e6510:~/Desktop$ ./ranges -N=5 -M=9999997
 0 : from       0 to 1999999 (2000000)
 1 : from 2000000 to 3999999 (2000000)
 2 : from 4000000 to 5999999 (2000000)
 3 : from 6000000 to 7999999 (2000000)
 4 : from 8000000 to 9999997 (1999998)