题解 | #合并表记录#

my_dict = {}

flag = int(input())

while flag>0:
    
    key_value = input()

    key, value = key_value.split(' ')

    if int(key) in my_dict:
        my_dict[int(key)] += int(value)
    else:
        my_dict[int(key)] = int(value)  

    flag -= 1

my_dict = dict(sorted(my_dict.items())) 

for key in my_dict:
    print(key, my_dict[key])