题解 | #合并表记录#

n = int(input())
L = []
dic = {}
for i in range(n):
    a = input()
    b = a.split()
    b = [int(i) for i in b]
    if b[0] not in L:
        L.append(b[0])
    if b[0] in dic.keys():
        dic[b[0]] = dic[b[0]] + b[1]
    else:
        dic[b[0]] = b[1]
L.sort()
for i in range(len(dic)):
    print(str(L[i])+" "+str(dic[L[i]]))