Solved by undefined_is_falsy

#	Title	# Solved	Avg. Tries
7562	Knight Moves STANDARD	26,980	1.90
7568	덩치	51,691	1.78
7569	토마토 STANDARD	32,286	2.34
7576	토마토 STANDARD	52,219	2.68
7662	Dual Priority Queue	12,975	4.53
7785	Easy work	21,005	2.45
7795	Eat or Be Eaten	6,920	1.98
8393	Sum STANDARD	166,185	1.56
8958	Score	98,955	1.94
9012	Parenthesis	78,655	2.16
9019	DSLR	14,634	4.77
9020	Goldbach’s Conjecture	27,796	2.54
9063	대지	15,725	1.56
9086	문자열 STANDARD	52,870	1.56
9095	Adding 1s, 2s, and 3s	61,494	1.54
9184	Function Run Fun	16,886	2.34
9251	LCS	29,914	2.42
9328	Keys	4,903	3.64
9372	Flying Safely	11,526	1.63
9375	Incognito	21,859	1.80
9461	Padovan Sequence	42,335	2.30
9465	Stickers	27,489	2.13
9466	Term Project	12,910	4.14
9498	시험 성적 STANDARD	203,361	1.83
9506	Federation Favorites	25,052	1.97
9663	N-Queen	39,829	2.14
9934	OBILAZAK	5,401	1.45
9935	EKSPLOZIJA	18,001	3.74
9996	VJEKO	5,550	3.76
10026	Cow Art	33,281	1.76
10101	Triangle Times	24,768	1.76
10171	Cats STANDARD	182,529	2.80
10172	Dogs STANDARD	178,390	2.33
10250	ACM Hotel	59,842	3.00
10423	전기가 부족해	2,220	1.43
10430	나머지 STANDARD	194,372	1.95
10709	기상캐스터	4,583	1.33
10773	Zero That Out	59,396	1.46
10775	Gates	6,687	2.81
10798	세로읽기	37,098	2.08
10799	쇠막대기	27,875	1.53
10807	개수 세기 STANDARD	80,582	1.62
10808	알파벳 개수 STANDARD	31,832	1.46
10809	알파벳 찾기	109,031	1.87
10810	공 넣기	46,886	1.92
10811	바구니 뒤집기	40,135	1.90
10813	공 바꾸기	45,815	1.58
10814	나이순 정렬	56,423	2.28
10815	숫자 카드	40,070	2.34
10816	숫자 카드 2	47,251	2.63

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