题解 def func():n = int(input())dic = {}while n > 0:List = list(map(int, input().split( )))if List[0] not in dic.keys():dic[List[0]] = List[1]else:dic[List[0]] = dic[List[0]] + List[1]n -= 1dic = sorted(dic.items(), key=lambda x:x[0])for item in dic:print(item[0], item[1])if __name__ == __main__:func()