n = input()
dic = dict()
for i in range(int(n)):
line = list(map(int, input().split()))
key = line[0]
value = line[1]
dic[key] = dic.get(key,0)+value
l = sorted(dic.keys())
for i in l:
print(i, dic[i])
dic = dict()
for i in range(int(n)):
line = list(map(int, input().split()))
key = line[0]
value = line[1]
dic[key] = dic.get(key,0)+value
l = sorted(dic.keys())
for i in l:
print(i, dic[i])
我已经通过这道题!
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