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• special column

• Blue Bridge Cup Python

Today is the first question of the 2021 provincial competition. Come on~

Brush one question every day without saying much. Brush the questions for nearly two years first. From 2020, if you have one together, you can join us!!!

Let's brush the questions together and impact the national competition!!!

Scan code My home page Group QR code on the left of the page.

Joining method: you can add me on the wechat business card below, and then pull you into the group. (remember the note code: I want to win the National Award)

Overview of the 12th Blue Bridge Cup in 2021

These are the questions in 2020. There are two types: result filling and program design. We brush one question every day. There is no problem in saving the game!

Card (title)

(total score of this question: 5 points)

Official practice system: https://www.lanqiao.cn/problems/1443/learning/

- > [problem description]

Xiaolan has a lot of digital cards, and the numbers on each card are 00 to 99. Xiaolan is going to use these cards to spell some numbers. He wants to spell positive integers from 11. Each time he spell one, he will save it. The card can't be used to spell other numbers. Xiaolan wants to know how much she can spell from 11. For example, when Xiaolan has 3030 cards, including 33 cards from 00 to 99, Xiaolan can spell 11 to 1010, but there is only one card 11 when spelling 1111, which is not enough to spell 1111. Now Xiaolan has 20212021 cards from 00 to 99, a total of 2021020210. How much can Xiaolan spell from 11? Tip: it is recommended to use computer programming to solve the problem

- > [result description]

This question is a blank filling question. You only need to calculate the result and use the output statement in the code to output the filled result.

analysis

By reading the question stem, this question - the difficulty is simple: ⭐

Type of investigation: violence, filling in the blank

Investigate knowledge points: dictionary and enumeration

analysis:

According to the question stem, it's very simple. If we say that we are directly violent, we will reduce one piece after using a number. In this way, we have been testing the cycle, which is simple and rough!

Open it directly below!!!

code

Python code implementation:
Method 1:

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2022/3/5 20:01
# @Author: cheshen, 18 Fuxue Road
# @Email   : yurz_control@163.com
# @File    : Day11.py

# 2021 from 0 to 9, 20210 in total
n = 2021
number = ['0','1','2','3','4','5','6','7','8','9']  # Ten numeric characters
num = {}  # Using dictionary
for i in number:
    if i not in num:
        num[i] = n
print(num)      # {'0': 2021, '1': 2021, '2': 2021, '3': 2021, '4': 2021, '5': 2021, '6': 2021, '7': 2021, '8': 2021, '9': 2021}



# Cyclic iteration
res = 0      # Set counter
stop = 0     # Set exit identifier
while True:
    if stop == 1:
        break   # Set exit
    # Combined number
    res += 1    # Start stacking
    res_str = [x for x in str(res)]      # Convert numbers into characters, and then separate numbers from multiple characters
    print(res_str)      # For example: ['1', '2']
    # Find and delete numbers in the dictionary
    for y in res_str:
        if y in num:
            num[y] -= 1                       # If it contains a number, delete one
    if 0 in num.values():                     # If the value of a number in num is 0, that is, it is used up, then stop the calculation and set the stop condition
        stop = 1

print(res)      # You can spell the number 3181

Example 1:

Method 2:

num=0  #num is used to accumulate the number of times of the used number "1"
for i in range(1,10000):
       num+=str(i).count("1")  #How many times does 1 add to num
       if num>2021:  #When the number of num exceeds 2021, the number of cards is insufficient
              break
print(i-1)

Very fast~

The final result is 3181

Today, the first question of 2021 provincial competition, come on!

Thus, we can quickly get the results, and the verification is completed!

Today is the 11th day of brush, the difficulty is general. Welcome to join us, become stronger together, self-discipline together, and go to the national competition together!!!

Today's topic is generally ha. If you have different solutions, you can leave a message below~

Previous question brushing route:

Question brushing route	Detail
	2020
Day-01	Make doorplate
Day-02	Looking for 2020
Day-03	Running exercise
Day-04	Serpentine filling number
Day-05	sort
Day-06	Decorative beads
Day-07	Achievement statistics
Day-08	Word analysis
Day-09	Digital triangle
Day-10	Plane segmentation
–	–
	2021

Official question brushing exercise system: http://lx.lanqiao.cn/

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