Переведите пожалуйста с Python на C++

from collections import defaultdict
from sys import stdin
 
clients = defaultdict(lambda: defaultdict(int))
for line in stdin.readlines():
    client, thing, value = line.split()
    clients[client][thing] += int(value)
         
for client in sorted(clients):
    print(client + ':')
    for thing in sorted(clients[client]):
        print(thing, clients[client][thing])