题解 | #合并表记录#
合并表记录
https://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
n = int(input())
dic = {}
for i in range(n):
line = str(input())
line2 = line.split()
key = int(line2[0])
value = int(line2[1])
dic[key] = dic.get(key, 0) + value
for each in sorted(dic):
print(each, dic[each])
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