Super Piano: [BZOJ 2006] [NOI 2010] super piano (Table greedy + ST + stack)
Drugs can not stop: [HDU 3712] Fiolki (right band edge disjoint-set heuristic merge +)
Monitoring: like "Flag Program" is to get rid of different interval is completely contained
Flag Program: [BZOJ4444] [Luogu 4155] [LOJ 2007] [SCOI2015] Flag Program (multiplication)
Ball machine: [BZOJ3133] [Baltic2013] ballmachine (+ tree multiplier stack)