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Hard

Minimum Time to Visit a Cell In a Grid Problem

Minimum Obstacle Removal to Reach Corner Problem

Valid Arrangement of Pairs Problem

Sliding Puzzle Problem

Shortest Subarray with Sum at Least K Problem

Minimum Total Distance Traveled Problem

Height of Binary Tree After Subtree Removal Queries Problem

Parsing A Boolean Expression Problem

Smallest Range Covering Elements from K Lists Problem

Sum of Prefix Scores of Strings Problem

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