|  | CIRCLEROUTES | Circle Routes | Corea | 40 | 57% | 
				
					
						|  | CIRCLES | Union of Circles | kriii | 141 | 30% | 
				
					
						|  | CITYDRIVING | City Driving | VOCList | 91 | 17% | 
				
					
						|  | CIV5 | The number of shortest paths in Civilization V | astein | 580 | 8% | 
				
					
						|  | CLEANER | 어떤 과학의 인공지능 청소기 | kcm1700 | 558 | 55% | 
				
					
						|  | CLEANING | 정리정돈 | mjy0503 | 216 | 19% | 
				
					
						|  | CLEARSKYPROJECT | 맑은 하늘 프로젝트 | Kureyo | 689 | 16% | 
				
					
						|  | CLUBROOM | 동아리방 구별 | mjy0503 | 210 | 21% | 
				
					
						|  | CODERS | Coders Invitation | lewha0 | 133 | 28% | 
				
					
						|  | COGIRUN | 코기런 | 꿀호떡 | 302 | 15% | 
				
					
						|  | COINS | Coin Change | JongMan | 3143 | 44% | 
				
					
						|  | COLORING | Coloring Madness | kriii | 1 | 0% | 
				
					
						|  | CONCERT | 콘서트 | hyunhwan | 3734 | 19% | 
				
					
						|  | CONVERT | Conversions | VOCList | 4859 | 49% | 
				
					
						|  | COUNTARRAY | 배열 세기 | tncks0121 | 67 | 28% | 
				
					
						|  | COUNTPALIN | 얼마나 많은 회문 거리가 있을까? | Kureyo | 860 | 16% | 
				
					
						|  | CUBESLIAR | Cubes Incognitanus, the liar | kcm1700 | 87 | 18% | 
				
					
						|  | DART | Dart | 일루 | 15 | 46% | 
				
					
						|  | DEATH | The Game of Death | JongMan | 374 | 25% | 
				
					
						|  | DECODE | Decoding | VOCList | 575 | 48% |