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