题解 | 合并表记录

import sys
n = int(input())
dict1 = {}
for i in range(n):
    x,y = map(int,sys.stdin.readline().strip().split())
    if x not in dict1:
        dict1[x] = y
    else:
        dict1[x] += y
sorted_key = sorted(dict1.keys())
for x in sorted_key:
    print(x,dict1[x])



# n = int(sys.stdin.readline())
# d = {}
# for i in range(n):
#     x,y = map(int,sys.stdin.readline().split())
#     if x in d:
#         d[x] += y
#     else:
#         d[x] = y
# sorted_key = sorted(d.keys())
# for k in sorted_key:
#     print(k,d[k])