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7-1 처음에는 배열을 쓰려했는데, 오버플로우가 나기에 반복문으로 각각 받아주었다.
7-3 당연히 c가 제일 큰 변이라고 착각해 틀렸었는데, 문제에서 c가 제일 큰 변이라는 보장이 없기에 모든 케이스를 고려해주었다.