题解 | #合并表记录#
合并表记录
https://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
n=int(input())
dict={}
for i in range(n):
line=input().split()
key=int(line[0])
value=int(line[1])
if key in dict.keys():
dict[key]=int(dict[key])+int(value)
else:
dict[key]=value
for key,value in sorted(dict.items()):
print(f'{key} {value}')
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