题解 | #合并表记录#
合并表记录
https://www.nowcoder.com/practice/de044e89123f4a7482bd2b214a685201
from collections import defaultdict
n = int(input())
d = defaultdict(int)
for i in range(n):
idx, val = map(int, input().split())
d[idx] += val
for key in sorted(d):
print("{} {}".format(key, d[key]))
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