Jolly Jumper

JollyJumper.c

 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <math.h>
 int jolly( int nums[], int length)
 {
             //Pre-conditions
             if(length <= 0 )
               return 0;
             int i;
             int output[length];
             for (i = 1; i <= length - 1; i++)
             {
                 int current = abs(nums[i] - nums[i - 1]);
                 //If consecutive numbers are same
                 //The sequence can't be jolly.
                 //If the subtraction result fall beyond
                 //the last acceptable value of the range
                 //1 to n-1 then the sequence can't be jolly
                 //we needn't look any further.
                 if (current == 0 || current > length)
                     return 0;
                 else
                     output[current] = 1;
             }
             for (i = 1; i < length; i++)
             {
                 if (output[i] != 1)
                     return 0;
             }
             return 1;
 }