题解 | #合并表记录#
合并表记录
http://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
n=int(input())
dic={}
for i in range(n):
k,v=[int(j) for j in input().split(" ")]
dic[k]=dic.get(k,0) + v
for key in sorted(dic):
print(key,dic.get(key))
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