line sweep

• 218.the-skyline-problem H
• 1288.remove-covered-intervals M
• 57.insert-interval M
• 56. Merge Intervals M
• 715. Range Module H

dynamic programing

graph traversal

union find

knap sacks

csp

• N-Queens II
• Verbal Arithmetic Puzzle

greedy

• 452. Minimum Number of Arrows to Burst Balloons M

• 1282. Group the People Given the Group Size They Belong To M

• 763. Partition Labels M

• 1605. Find Valid Matrix Given Row and Column Sums M

• 921. Minimum Add to Make Parentheses Valid M

• 861. Score After Flipping Matrix M

• [1111. Maximum Nesting Depth of Two Valid Parentheses Strings] M

• 406. Queue Reconstruction by Height M

• 1433. Check If a String Can Break Another String M

• 1338. Reduce Array Size to The Half M

• 402. Remove K Digits M

• 45. Jump Game II H

• [502. IPO] H