题解 | #合并表记录#
合并表记录
http://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
import collections
dic = collections.defaultdict(int)
n = int(input())
for _ in range(n):
index, val = list(map(int, input().split()))
dic[index] += val
for index, val in sorted(dic.items(), key = lambda x: x[0]): #需要根据key进行排序
print(index, val)
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