g0501_0600.s0509_fibonacci_number.Solution Maven / Gradle / Ivy

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Java Solution for LeetCode algorithm problems, continually updating

There is a newer version: 1.24

package g0501_0600.s0509_fibonacci_number;

// #Easy #Dynamic_Programming #Math #Recursion #Memoization #Dynamic_Programming_I_Day_1
// #Level_1_Day_10_Dynamic_Programming #Udemy_Dynamic_Programming
// #2022_07_25_Time_0_ms_(100.00%)_Space_41.4_MB_(15.60%)

public class Solution {
    private int[] memo = new int[31];

    public int fib(int n) {
        if (n == 0) {
            return 0;
        }
        if (n == 1) {
            return 1;
        }
        if (memo[n] != 0) {
            return memo[n];
        }
        memo[n] = fib(n - 1) + fib(n - 2);
        return memo[n];
    }
}