题解 | #合并表记录#

import sys
dic = {}
b = 0
c=[]
for line in sys.stdin:
    a = line.split();
    if len(a) == 1:
        b=int(a[0])
    if len(a)>1:
        c.append(a[0]);
        dic[int(a[0])] = dic.get(int(a[0]),0)+int(a[1]);
    if b == len(c):
            for i in sorted(dic):
                print(i,dic[i]);