最近两年初赛答案解析

csp-j2020入门组真题答案及解析
https://www.cnblogs.com/BobHuang/p/13800840.html

csp-s2020提高组真题答案及解析
https://www.cnblogs.com/Rainy7/p/csp-s-2020-first.html

csp-j2019入门组真题答案及解析
https://blog.csdn.net/weixin_39104847/article/details/108671116

洛谷2020初赛模拟题答案及解析
https://www.cnblogs.com/Dfkuaid-210/p/13786364.html