题解 | #合并表记录#

while True:
    try:
        n = int(input())
        res = {}
        for i in range(n):
            a, b = map(int, input().split())
            if a in res:
                res[a] = res[a] + b
            else:
                res[a] = b
        res1 = sorted(res.items(), key=lambda x: x[0])
        for i, j in res1:
            print(f"{i} {j}")
    except:
        break