题解 | #合并表记录#

n = eval(input())
d = {}
for i in range(n):
    x1,x2 = input().strip().split(" ")

    d[x1]= eval(x2)+d.get(x1,0)
output = sorted(d.items(),key=lambda x:eval(x[0]),reverse=False)
for i in output:
    print(i[0],i[1])