Jolly Jumpers/1002

~cpp
def jolly(values):
    return sum(i-e for i,e in zip(range(1,len(values)+1), 
        sorted((abs(values[i]-values[i+1]) 
                for i in range(len(values)-1))))) == 0

for e in [[1,4,2,3],[1,4,2,-1,6]]: print jolly(e)