class TrustItem:
    
    def __init__(self):
        self.marked = False
        self.trustees = 0

class Solution:
    def findJudge(self, N, trust):
        
        if (len(trust) == 0):
            return 1
        
        trust_results = dict()
        # add to hm key for trusted member
        # mark a key if it trusts someone
        for t in trust:
            if t[0] not in trust_results:
                trust_results[t[0]] = TrustItem()
            trust_results[t[0]].marked = True
            
            if t[1] not in trust_results:
                trust_results[t[1]] = TrustItem()
            trust_results[t[1]].trustees += 1
            
        for key, value in trust_results.items():
            if not value.marked and value.trustees == N - 1:
                return key
        
        return -1

s = Solution()
print("Expected: 2")
print("Got:", s.findJudge(2, [[1, 2]]))