题解 | 合并表记录

n = input()
result = {}
for i in range(int(n)):
    res = input().split()
    result[res[0]] = result.get(res[0], 0) + int(res[1])

result = sorted(result.items(), key=lambda x: int(x[0]))
for i in result:
    print(i[0], str(i[1]))