快乐冲浪与生活

多体验、多体会、多体悟

0%

代码

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: a2htray
# create date: 2023/3/12

"""
PAT 乙级 1029
"""

if __name__ == '__main__':
    statement1 = input()
    statement2 = input()

    got_dict = {}

    statement1 = statement1.upper()
    statement2 = statement2.upper()
    for c in statement1:
        if c not in got_dict:
            if c not in statement2:
                got_dict[c] = True
                print(c, end='')

jobs 命令主要用于显示系统中的任务列表及运行状态。在 Linux 中,每一个 job 都有一个唯一 ID,系统管理员通过任务 ID 对任务进行管理,可使其在前后或后台运行。通常任务和进程是等价的,只在于说侧重不同。即任务之于用户,相应地,进程之于系统。

代码

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: a2htray
# create date: 2023/3/9

"""
PAT 乙级 1026
"""

if __name__ == '__main__':
    start_clock, end_clock = map(int, input().split(' '))
    duration = 1.0 * (end_clock - start_clock) / 100

    h = int(duration // 3600)
    m = int(duration % 3600 // 60)
    s = str(duration % 3600 % 60)

    tokens = s.split('.')

    add = 1 if int(tokens[1][0]) >= 5 else 0
    s = int(tokens[0]) + add

    print('%02d:%02d:%02d' % (h, m, s))

flag 包定义了一系列函数,可用于定义命令行参数,支持的参数类型如下:

  • string:flag.StringVar 函数
  • bool:flag.BoolVar 函数
  • time.Duration: flag.DurationVar 函数
  • int: flag.IntVar 函数
  • uint: flag.UintVar 函数
  • float64: flag.Float64Var 函数
  • int64: flag.Int64Var 函数
  • uint64: flag.Uint64Var 函数

在命令行工具的开发过程中,我们常常需要设置一个同时支持短名称和长名称的选项,如 -d 等价于 --debug-p 等价于 --password。在使用 Go flag 包的情况下,该需求的实现相当简单,只需要定义两个不同的 flag 指向同一个变量即可。

代码

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: a2htray
# create date: 2023/3/8

"""
PAT 乙级 1024
"""
from typing import List


class SciNumber:
    def __init__(self, s: str):
        self.sign = '-' if s[0] == '-' else ''
        nums, exp = s[1:].split('E')
        self.nums = [v for v in nums]
        self.left_move = exp[0] == '-'
        self.exp = int(exp[1:])

        # print(self.sign, self.nums, self.left_move, self.exp)

    def to_number(self) -> List[str]:
        if self.left_move:
            ret = ['0'] * self.exp + self.nums
            del ret[ret.index('.')]
            return ret[0:1] + ['.'] + ret[1:]
        else:
            n = len(self.nums[2:])
            if self.exp >= n:
                ret = self.nums + ['0'] * (self.exp - n)
                del ret[1]
            else:
                ret = self.nums
                for i in range(1, 1 + self.exp):
                    ret[i], ret[i + 1] = ret[i + 1], ret[i]

            if ret[0] == '0':
                ret = ret[1:]
            return ret


if __name__ == '__main__':
    sci_number = SciNumber(input())
    print(sci_number.sign + ''.join(sci_number.to_number()))

代码

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: a2htray
# create date: 2023/3/8

"""
PAT 乙级 1023
"""

if __name__ == '__main__':
    digits = []
    for i, digit in enumerate(map(int, input().split(' '))):
        digits += [i] * digit

    digits.sort()

    if digits[0] != 0:
        print(''.join(map(str, digits)))
        exit(0)

    for i, v in enumerate(digits):
        if v != 0:
            digits[0], digits[i] = digits[i], digits[0]
            break
    print(''.join(map(str, digits)))

代码

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: a2htray
# create date: 2023/3/7

"""
PAT 乙级 1021
"""

if __name__ == '__main__':
    counts = [0] * 10
    for s in input():
        counts[int(s)] += 1

    for i, count in enumerate(counts):
        if count != 0:
            print('%d:%d' % (i, count))

代码

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: a2htray
# create date: 2023/3/6

"""
PAT 乙级 1020
"""
from functools import cmp_to_key


class MoonCake:
    def __init__(self, num, total_price):
        self.num = num
        self.total_price = total_price
        self.unit_price = 1.0 * self.total_price / self.num


def cmp(mooncake1, mooncake2):
    return -1 if mooncake1.unit_price > mooncake2.unit_price else 1


if __name__ == '__main__':
    n_class, max_requirement = map(int, input().split(' '))

    mooncakes = []
    for item in zip(map(float, input().split(' ')), map(float, input().split(' '))):
        if item[0] == 0 or item[1] == 0:
            continue
        mooncakes.append(MoonCake(item[0], item[1]))

    mooncakes = sorted(mooncakes, key=cmp_to_key(cmp))

    sale_price = 0.0

    for i in range(n_class):
        if max_requirement >= mooncakes[i].num:
            sale_price += mooncakes[i].total_price
            max_requirement = max_requirement - mooncakes[i].num
        else:
            sale_price += max_requirement * mooncakes[i].unit_price
            max_requirement = 0
            break

    print('%.2f' % sale_price)

代码

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: a2htray
# create date: 2023/3/6

"""
PAT 乙级 1019
"""


def get_sorted_nums(num_str):
    dn = 4 - len(num_str)
    for _ in range(dn):
        num_str = '0' + num_str

    nums = list(map(int, num_str))
    nums.sort()

    return 1 * nums[0] + 10 * nums[1] + 100 * nums[2] + 1000 * nums[3], \
           1 * nums[3] + 10 * nums[2] + 100 * nums[1] + 1000 * nums[0]


num_str = input()
num1, num2 = get_sorted_nums(num_str)

if num1 == num2:
    print(f'{num1:04d} - {num2:04d} = 0000')
    exit(0)

while num1 - num2 != 6174:
    diff = num1 - num2
    print(f'{num1:04d} - {num2:04d} = {diff:04d}')
    num1, num2 = get_sorted_nums(str(diff))

diff = num1 - num2
print(f'{num1:04d} - {num2:04d} = {diff:04d}')