[SWEA] 17937. 큰 수의 최대공약수
출처 https://swexpertacademy.com/main/code/problem/problemDetail.do?problemLevel=3&contestProbId=AYmRI_8ajv8DFARi&categoryId=AYmRI_8ajv8DFARi&categ...
출처 https://swexpertacademy.com/main/code/problem/problemDetail.do?problemLevel=3&contestProbId=AYmRI_8ajv8DFARi&categoryId=AYmRI_8ajv8DFARi&categ...
출처 https://swexpertacademy.com/main/code/problem/problemDetail.do?problemLevel=3&contestProbId=AV-0U8FKZLQDFAXT&categoryId=AV-0U8FKZLQDFAXT&categ...
출처 https://www.acmicpc.net/problem/1260
출처 https://www.acmicpc.net/problem/2178
출처 https://www.acmicpc.net/problem/2644