2020年软件类第十一届蓝桥杯 省赛 python组（人生苦短，我用python）
Posted 风信子的猫Redamancy
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了2020年软件类第十一届蓝桥杯 省赛 python组（人生苦短，我用python）相关的知识，希望对你有一定的参考价值。
2020年软件类第十一届蓝桥杯 省赛 python组 题解
文章目录
备战蓝桥杯的时候，记录一下写的题目和一些思考和理解
这里面的题目都可以从https://www.lanqiao.cn/courses/2786/learning/?id=88912得到，写了一些python的解法
试题 A: 门牌制作
本题总分：5 分
【问题描述】
小蓝要为一条街的住户制作门牌号。
这条街一共有 2020 位住户，门牌号从 1 到 2020 编号。
小蓝制作门牌的方法是先制作 0 到 9 这几个数字字符，最后根据需要将字
符粘贴到门牌上，例如门牌 1017 需要依次粘贴字符 1、0、1、7，即需要 1 个 字符 0，2 个字符 1，1 个字符 7。
请问要制作所有的 1 到 2020 号门牌，总共需要多少个字符 2？
思路
这里可以利用哈希表的想法，最后得到字符2的数目可以直接利用h[‘2’]就可以得到数目
import collections
h = collections.Counter()
for i in range(1,2021):
for x in str(i):
h[x] += 1
print(h['2'])
答案
624
试题 B: 寻找 2020
本题总分：5 分
【问题描述】
小蓝有一个数字矩阵，里面只包含数字 0 和 2。小蓝很喜欢 2020，他想找
到这个数字矩阵中有多少个 2020 。
小蓝只关注三种构成 2020 的方式：
- 同一行里面连续四个字符从左到右构成 2020。
- 同一列里面连续四个字符从上到下构成 2020。
- 在一条从左上到右下的斜线上连续四个字符，从左上到右下构成 2020。
例如，对于下面的矩阵：
220000
000000
002202
000000
000022
002020
一共有 5 个 2020。其中 1 个是在同一行里的，1 个是在同一列里的，3 个 是斜线上的。
小蓝的矩阵比上面的矩阵要大，由于太大了，他只好将这个矩阵放在了一 个文件里面，在试题目录下有一个文件 2020.txt，里面给出了小蓝的矩阵。
请帮助小蓝确定在他的矩阵中有多少个 2020。
这里给出这个2020.txt的内容
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2021年软件类第十二届蓝桥杯 省赛 python组 F-J题解
2021年软件类第十二届蓝桥杯第二场省赛 python组 F-J题解