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0851-0860

851. Loud and Rich $\star\star$

852. Peak Index in a Mountain Array $\star$

853. Car Fleet $\star\star$

854. K-Similar Strings $\star\star\star$

855. Exam Room $\star\star$

856. Score of Parentheses $\star\star$

857. Minimum Cost to Hire K Workers $\star\star\star$

858. Mirror Reflection $\star\star$

859. Buddy Strings $\star$

860. Lemonade Change $\star$