传送门：洛谷 CF2218E The 67th XOR Problem | Codeforces E. The 67th XOR Problem 更佳的...
传送门：洛谷 CF2209C Find the Zero | Codeforces C. Find the Zero更佳的阅读体验：CF2209C 题解简...
传送门：洛谷 CF2194C Secret message | Codeforces C. Secret message更佳的阅读体验：CF2194C 题...
传送门：洛谷 CF2167G Mukhammadali and the Smooth Array | Codeforces G. Mukhammadali...