- C. Prepend and Append: https://codeforces.net/problemset/problem/1791/C
- D. Black and White Stripe: https://codeforces.net/problemset/problem/1690/D
- D. 1D Eraser: https://codeforces.net/contest/1873/problem/D
- B. Long Long: https://codeforces.net/problemset/problem/1843/B
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