def solution(id_list, report, k): li = dict() result = dict() send_li = [] receive_li = [] answer = [] all = [] for i in range(len(report)) : send, receive = report[i].split() if [send, receive] in all : continue else : send_li.append(send) receive_li.append(receive) all.append([send, receive]) li[receive] = 0 for i in id_list : result[i] = 0 for j in receive_li : li[j] += 1 for key, value in li..