997. Find the Town Judge

class Solution(object):
    def findJudge(self, n, trust):
        dict1={}
        c=0
        j=-1
        for i in range(1,n+1):
            dict1[i]=True
        for i in trust:
            dict1[i[0]]=False
        
        for i in dict1:
            if dict1[i]==True:
                j=i
        for i in trust:
            if i[1]==j:
                c+=1
        if c==n-1:
            return j
        return -1