题解 | #合并表记录#
合并表记录
https://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
n = int(input()) #键值对的个数
dic = {}
for i in range(n):
k,v = list(map(int,input().split()))
dic[k] = dic.get(k,0) + v
for k in sorted(dic):
print(k,dic[k])
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