CalK16

class Solution:
    def countOfAtoms(self, formula: str) -> str:
        i = 0
        ans = ""

        def _countOfAtoms(formula):
            nonlocal i
            counts = defaultdict(int)
            while i < len(formula):
                if formula[i] == "(":

CalK16

class Solution:
    def solveNQueens(self, n: int) -> List[List[str]]:
        leftright = [0] * (2 * n - 1)
        rightleft = [0] * (2 * n - 1)
        row = [0] * n
        col = [0] * n
        
        def valid(board, x, y):
            return not (
                row[x] or col[y]

CalK16

# 加载 math 库，这个库有很多有用的模块可以用。你可以在本次作业中使用
# math.isclose(a, b, rel_tol=1e-10) 来比较 a 和 b。并且只比较到小数点后10位。
# 例如 math.isclose(5.0, 4.99998, rel_tol=1e-10) 会返回 True, 意思是 5.0 跟 4.99998 足够相似了。
# 如果你认为你不需要这个函数，可以忽略它。
import math

# 在此处定义你的 `expected_value` 函数
# def ....
#     .....

CalK16

import os

GAME_BOARD = [[' '] * 3 for _ in range(3)]
COL = ROW = 3

def print_game_board():
    count_row = 0
    for row in GAME_BOARD:
        a_row = ""
        for col in row:

CalK16

BANK_ACCOUNT = "steven"
PASSWORD = "123456"
failed_attempts = 0
balance = 1000

def welcome():
	print("Welcome to my ATM machine!")


def get_bank_account():

CalK16

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>

#define MAX_NAME 256
#define TABLE_SIZE 10

typedef struct {

CalK16

# So, you want to learn MinHeap. Here's an example of min heap.
# Sometimes you panic when you see so many lines of code, but trust me it is worth to read.
# Because there are only three operations: get peek, add item, and poll item.
# The functions are well divided in small functions, very simple, easy to understand.
class MinHeap():
    def __init__(self):
        self.arr = []

    def peek(self):
        if self._is_empty():

CalK16

import os
import time
import shutil
import signal
import sys


############# Fill this Box ###################
# source_directory: folder which containers files to grab from
# target_directory: folder where to store files

CalK16

from ics import Calendar, Event
import datetime
from lunarcalendar import Converter, Solar, Lunar, DateNotExist

c = Calendar()
for i in range(2020, 2100):
	lunar = Lunar(i, 7, 7)
	d = Converter.Lunar2Solar(lunar)
	str_d = d.to_date().strftime('%Y-%m-%d 00:00:00')
	e = Event()