# Problem Title Actions Difficulty
1City with the smallest number of neighbors at a threshold distanceRead ArticleSolve ProblemEasy
2Critical Connections in a NetworkRead ArticleSolve ProblemMedium
3Minimum number of apples to guarantee M red applesRead ArticleSolve ProblemMedium
4Longest substring where all characters appear at least K timesRead ArticleSolve ProblemMedium
5Geek's Garden ProblemRead ArticleSolve ProblemMedium
6Matrix Prefix SumRead ArticleSolve ProblemMedium