Buggy python submission (verdict: Time Limit Exceeded):
import math

N, C, K = map(int, input().split())
t_dic = {}
for j in range(N):
    t_num = int(input())
    num = t_dic.get(t_num, 0)
    t_dic[t_num] = num + 1

t_list = sorted(t_dic.keys())
removed_man_dic = {}
total_car = 0
for i, t in enumerate(t_list):
    limit = t + K
    limit_num = t_dic[t] - removed_man_dic.get(t, 0)
    if limit_num == 0:
        continue
    car_num = int(math.ceil(limit_num / C))
    total_car += car_num
    passenger = C * car_num
    remaining_seat = passenger - limit_num
    removed_man_dic = {}
    for j in t_list[i+1:]:
        if j >= limit:
            break
        num = t_dic.get(j, 0)
        if num <= remaining_seat:
            remaining_seat -= num
            removed_man_dic[j] = num
        else:
            removed_man_dic[j] = remaining_seat
            break

print(total_car)


Fixed submission:
N, C, K = map(int, input().split())
t_sorted = [int(input()) for _ in range(N)]
t_sorted.sort()

car = 0
passenger = 0
target_t, limit = 0, 0
for i, t in enumerate(t_sorted):
    if target_t == 0:
        target_t = t
        limit = t + K
    passenger += 1
    if passenger == C:
        car += 1
        passenger = 0
        target_t = 0
        continue
    if i != N - 1:
        if t_sorted[i + 1] > limit:
            car += 1
            passenger = 0
            target_t = 0
            continue
if passenger > 0:
    car += 1

print(car)

Buggy python submission (verdict: Time Limit Exceeded):
import math

N, C, K = map(int, input().split())
t_dic = {}
for i in range(N):
    t_num = int(input())
    num = t_dic.get(t_num, 0)
    t_dic[t_num] = num + 1

t_list = t_dic.keys()
removed_man_dic = {}
total_car = 0
for key, value in sorted(t_dic.items(), key=lambda x: x[0]):
    limit = key + K
    limit_num = t_dic[key] - removed_man_dic.get(key, 0)
    if limit_num == 0:
        continue
    car_num = int(math.ceil(limit_num / C))
    total_car += car_num
    passenger = C * car_num
    remaining_seat = passenger - limit_num
    removed_man_dic = {}
    for i in range(key + 1, limit + 1):
        if i not in t_list:
            continue
        num = t_dic.get(i, 0)
        if num <= remaining_seat:
            remaining_seat -= num
            removed_man_dic[i] = num
        else:
            removed_man_dic[i] = remaining_seat
            break

print(total_car)


Fixed submission:
N, C, K = map(int, input().split())
t_sorted = [int(input()) for _ in range(N)]
t_sorted.sort()

car = 0
passenger = 0
target_t, limit = 0, 0
for i, t in enumerate(t_sorted):
    if target_t == 0:
        target_t = t
        limit = t + K
    passenger += 1
    if passenger == C:
        car += 1
        passenger = 0
        target_t = 0
        continue
    if i != N - 1:
        if t_sorted[i + 1] > limit:
            car += 1
            passenger = 0
            target_t = 0
            continue
if passenger > 0:
    car += 1

print(car)

Buggy python submission (verdict: Time Limit Exceeded):
import math

N, C, K = map(int, input().split())
t_dic = {}
for i in range(N):
    t_num = int(input())
    num = t_dic.get(t_num, 0)
    t_dic[t_num] = num + 1

removed_man_dic = {}
total_car = 0
for key, value in sorted(t_dic.items(), key=lambda x:x[0]):
    limit = key + K
    limit_num = t_dic[key] - removed_man_dic.get(key, 0)
    if limit_num == 0:
        continue
    car_num = int(math.ceil(limit_num / C))
    total_car += car_num
    passenger = C * car_num
    remaining_seat = passenger - limit_num
    removed_man_dic = {}
    for i in range(key + 1, limit + 1):
        num = t_dic.get(i, 0)
        if num <= remaining_seat:
            remaining_seat -= num
            removed_man_dic[i] = num
        else:
            removed_man_dic[i] = remaining_seat
            break

print(total_car)


Fixed submission:
N, C, K = map(int, input().split())
t_sorted = [int(input()) for _ in range(N)]
t_sorted.sort()

car = 0
passenger = 0
target_t, limit = 0, 0
for i, t in enumerate(t_sorted):
    if target_t == 0:
        target_t = t
        limit = t + K
    passenger += 1
    if passenger == C:
        car += 1
        passenger = 0
        target_t = 0
        continue
    if i != N - 1:
        if t_sorted[i + 1] > limit:
            car += 1
            passenger = 0
            target_t = 0
            continue
if passenger > 0:
    car += 1

print(car)