시간 제한 | 메모리 제한 | 제출 | 정답 | 맞힌 사람 | 정답 비율 |
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1 초 | 1024 MB | 139 | 79 | 46 | 50.000% |
To improve the organization of his farm, Farmer John labels each of his N (1 ≤ N ≤ 5,000) cows with a distinct serial number in the range 1..20,000. Unfortunately, he is unaware that the cows interpret some serial numbers as better than others. In particular, a cow whose serial number has the highest prime factor enjoys the highest social standing among all the other cows.
(Recall that a prime number is just a number that has no divisors except for 1 and itself. The number 7 is prime while the number 6, being divisible by 2 and 3, is not).
Given a set of N (1 ≤ N ≤ 5,000) serial numbers in the range 1..20,000, determine the one that has the largest prime factor.
4 36 38 40 42
38