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package ch23;
public class P91_2 {
// 문제 제약 조건에 따라 30에서 1칸 더 크게 지정
int[] dp = new int[31];
public int fib(int n) {
// 0과 1인 상향식과 마찬가지로 값을 미리 지정
if (n <= 1)
return n;
// 미리 계산한 결과가 있다면 해당 값 리턴
if (dp[n] != 0)
return dp[n];
dp[n] = fib(n - 1) + fib(n - 2);
return dp[n];
}
}
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