Matplotlib 学习笔记安装随便找了一个教程,这部分很简单,没有大问题
基本用法123456import matplotlib.pyplot as pltimport numpy as npx=np.linspace(-1,1,50)y1=x**2plt.plot(x,y)plt.show()
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问题 A: Colorful Subsequence题目描述You are given a string S of length N. Among its subsequences, count the ones such that all characters are different, mod
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