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C. Tile Painting (定理：任意一个合数都能够写成两个质数的乘积) 《Codeforces Round #599 (Div. 2) 》
A . Xu Xiake in Henan Province (签到） ( 2018-2019 ACM-ICPC, Asia Jiaozuo Regional Contest )
I. Distance (模拟）2018-2019 ACM-ICPC, Asia Jiaozuo Regional Contest
C Good String Codeforces Round #560 (Div. 3)
E Minimum Array ( Codeforces Round #555 (Div. 3) )
C. Almost Equal （ Codeforces Round #580 (Div. 2) ）
A - Perfect Team CodeForces - 1221C
G - Plus from Picture CodeForces - 1182B
A. Prime Subtraction （ Educational Codeforces Round 74 (Rated for Div. 2) ）
A Joysticks （Codeforces Round 345 (Div 2) ）