python runtime NZEC error

I looked at all previous post here in the forum, but I still can't figure out why I'm getting this NZEC here. I'm trying to solve SALARY, http://www.codechef.com/problems/SALARY and here are my submissions http://www.codechef.com/status/SALARY,ishubhamch

http://www.codechef.com/viewsolution/2188157

#!usr/bin/env python
import sys
def check(n,wl):
    i=0
    valid=True
    while i<n-1 and valid:
        valid=(wl[i]==wl[i+1])
        i+=1
    return valid
def incr(n,wl,count):
    mx=max(wl)
    #print 'Inside incr: n= ',n,'mx= ',mx,'count= ',count
    leftOne=False
    for i in range(n):
        if wl[i]==mx and leftOne==False:
            leftOne=True
        else:
            wl[i]+=1
    #print 'wl= ',wl
    count+=1
    if (check(n,wl)):
        print count
        return
    else:
        incr(n,wl,count)
    return


def main(argv=None):
    t=int(raw_input())
    #print 't= ',t
    while t>0:
        t-=1
        count=0
        n=int(raw_input())
        #print 'n= ',n
        wStr=raw_input()
        wl=wStr.split()
        for i in range(n):
            wl[i]=int(wl[i])
        #print 'wl= ',wl
        if check(n,wl):
            print count
        else:
            incr(n,wl,count)
    return 0

if __name__ == "__main__":
    sys.exit(main())