题解 | 合并表记录
N = int(input())
dic = {}
dic_key = []
for i in range(N):
x1,x2 = map(int, input().split())
if x1 in dic:
dic[x1] += x2
else:
dic[x1] = x2
dic_key.append(x1)
dic_key.sort()
for i in dic_key:
print(str(i) + ' ' + str(dic[i]))
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