https://leetcode.com/problems/pass-the-pillow/description/

Loop position in increasing-decreasing array #easy #math #simulation

https://leetcode.com/problems/water-bottles/description/

Bottles drink and exchange simulation #easy #math #simulation

https://leetcode.com/problems/find-the-winner-of-the-circular-game/description/

Last of k-th excluded from 1..n #medium #simulation #math

https://leetcode.com/problems/average-waiting-time/description/

Average of intersecting intervals #medium #simulation

https://leetcode.com/problems/spiral-matrix-iii/description/

2D spiraling order #medium #matrix #simulation

https://leetcode.com/problems/lemonade-change/description/

Simulate money exchange #easy #simulation