【AtCoder Grand Contest 020 D】Min Max Repetition
【Codeforces 639E】Bear and Paradox
【Codeforces 626G】Raffles
【Codeforces 578E】Walking!
【Codeforces 605E】Intergalaxy Trips
【Codeforces 521D】Shop
【Codeforces 505E】Mr. Kitayuta vs. Bamboos
【Codeforces 280D】k-Maximum Subsequence Sum
【Codeforces 675E】Trains and Statistic
【洛谷P5653】基础最优化练习题
