合并表记录(Python3解答）
合并表记录
http://www.nowcoder.com/questionTerminal/de044e89123f4a7482bd2b214a685201
while True:
try:
a=int(input())
dic = {}
for i in range(a):
key, val = input().split()
key = int(key)
val = int(val)
if key in dic:
dic[key] += val
else:
dic[key] = val
for i in sorted(dic.keys()):
print(str(i)+" "+str(dic[i]))
except:
break
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