SaiBot questions

SaiBot answers

• Optimal data structure and algorithm for getting the k'th element [duplicate]
• Check if a value belongs to a hash
• How a decision tree is made using cross-validation approach?
• Dynamic order statistic: get k-th element in constant time?
• Merging overlapping axis-aligned rectangles
• Choosing subset of farthest points in given set of points
• What is a multi-headed model? And what exactly is a 'head' in a model?
• Minimum number of train station stops
• Split up a number as the sum of two powers
• Need of declaration of a variable in a for loop [duplicate]