Buggy python submission (verdict: Runtime Error):
# -*- coding: utf-8 -*-
import sys
sys.setrecursionlimit(10000)  # RecursionError対策

def func(n):
    if n==0:
        return 0 # 終端条件
    if memo[n] != -1:
        return memo[n] # 探索済み

    res = n

    for i in range(1,n+1):
        pow6 = 6 ** i
        if pow6 > n:
            break
        res = min(res, func(n-pow6)+1)

    for i in range(1,n+1):
        pow9 = 9 ** i
        if pow9 > n:
            break
        res = min(res, func(n-pow9)+1)

    memo[n] = res
    return res


N = int(input())

max_n = 110000
memo = [-1] * max_n
ans = func(N)
print(ans)


Fixed submission:
# -*- coding: utf-8 -*-

def count(val1, val2):
    num = 1
    while True:
        if val1 < (val2 ** num):
            break
        num += 1

    cnt = 0
    digit = num
    while True:
        if val1 >= val2 ** digit:
            val1 -= val2 ** digit
            cnt += 1
        else:
            digit -= 1
        
        if digit== 0:
            break

    return cnt,val1


N = int(input())
ans = N

for i in range(0,N+1):
    n = i
    m = N - i
    res = 0

    cnt, nn = count(n, 9)
    n = nn
    res += cnt

    cnt, mm = count(m, 6)
    m = mm
    res += cnt

    res += n + m
    ans = min(ans, res)

print(ans)

Buggy python submission (verdict: Runtime Error):
# -*- coding: utf-8 -*-

def func(n):
    if n==0:
        return 0 # 終端条件
    if memo[n] != -1:
        return memo[n] # 探索済み

    res = n

    for i in range(1,n+1):
        pow6 = 6 ** i
        if pow6 <= n:
            res = min(res, func(n-pow6)+1)
        else:
            break

    for i in range(1,n+1):
        pow9 = 9 ** i
        if pow9 <= n:
            res = min(res, func(n-pow9)+1)
        else:
            break

    memo[n] = res
    return res


N = int(input())

max_n = 110000
memo = [-1] * max_n
ans = func(N)
print(ans)


Fixed submission:
# -*- coding: utf-8 -*-

def count(val1, val2):
    num = 1
    while True:
        if val1 < (val2 ** num):
            break
        num += 1

    cnt = 0
    digit = num
    while True:
        if val1 >= val2 ** digit:
            val1 -= val2 ** digit
            cnt += 1
        else:
            digit -= 1
        
        if digit== 0:
            break

    return cnt,val1


N = int(input())
ans = N

for i in range(0,N+1):
    n = i
    m = N - i
    res = 0

    cnt, nn = count(n, 9)
    n = nn
    res += cnt

    cnt, mm = count(m, 6)
    m = mm
    res += cnt

    res += n + m
    ans = min(ans, res)

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
# -*- coding: utf-8 -*-

def count(val1, val2):
    num = 1
    while True:
        if val1 < (val2 ** num):
            res = 0
            if num > 1:
                res = val2 ** (num-1)

            break  
        num += 1

    return res


N = int(input())
ans = N

for i in range(0,N+1):
    n = i
    m = N - i
    res = 0

    while True:
        num = count(n, 9)
        if num == 0:
            break
        n -= num
        res += 1

    while True:
        num = count(m, 6)
        if num == 0:
            break
        m -= num
        res += 1

    res += n + m
    ans = min(ans, res)


print(ans)


Fixed submission:
# -*- coding: utf-8 -*-

def count(val1, val2):
    num = 1
    while True:
        if val1 < (val2 ** num):
            break
        num += 1

    cnt = 0
    digit = num
    while True:
        if val1 >= val2 ** digit:
            val1 -= val2 ** digit
            cnt += 1
        else:
            digit -= 1
        
        if digit== 0:
            break

    return cnt,val1


N = int(input())
ans = N

for i in range(0,N+1):
    n = i
    m = N - i
    res = 0

    cnt, nn = count(n, 9)
    n = nn
    res += cnt

    cnt, mm = count(m, 6)
    m = mm
    res += cnt

    res += n + m
    ans = min(ans, res)

print(ans)