容斥原理 (共4题)
ID Problem Title Source AC Ratio Solved Tries
2450 PAROVI 双打(翻译:陈天祺) COCi 2015-2016 6th 100% 1 1
3995 Devu and Flowers Codeforces 451E 33% 6 18
4010 Sky Code SEERC 2008 100% 2 2
4096 开关(switch) ZJOI 2019 0% 0 0