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포인터를 써보았다. 파이썬보다 빨라서 좋았다. 다리 놓기 문제를 풀 때 처음에는 팩토리얼 함수를 만들어서 다 계산하려고했는데 long long int보다 더 커져버려서 실패했다. 계산과정에서 필요없는 계산을 줄이니 int로 해결됐다.