题解 | #合并表记录#

def get_ans(li):
    ans=dict()
    for i in range(int(li[0])):
        key,val=li[i+1].split(' ')
        key,val=int(key),int(val)
        ans[key]=ans.get(key,0)+val
    ans= sorted(ans.items(), key=lambda d:d[0]) 
    return ans

if __name__=='__main__':
    import sys
    lines = []
    while True:
        line = sys.stdin.readline().strip()
        if line == "":
            break
        lines.append(line)
    res=get_ans(lines)
    for i in res:
        print("{} {}".format(i[0], i[1]))