题解 | #合并表记录#

while True:
    try:
        n = int(input())
        record = {}
        for i in range(n):
            adict = list(map(int, input().split()))
            if adict[0] not in record.keys():
                record[adict[0]] = adict[1]
            else:
                record[adict[0]] += adict[1]
        keys = list(record.keys())
        keys.sort()
        for key in keys:
            print(key, end=' ')
            print(record[key])
    except:
        break