Add 509_Fibonacci_Number.java

Author: Sean Prashad

Dynamic Programming/509_Fibonacci_Number.java

@@ -0,0 +1,17 @@
+class Solution {
+ public int fib(int N) {
+ if (N <= 1) {
+ return N;
+ }
+
+ int[] dp = new int[N + 1];
+ dp[0] = 0;
+ dp[1] = 1;
+
+ for (int i = 2; i <= N; i++) {
+ dp[i] = dp[i - 1] + dp[i - 2];
+ }
+
+ return dp[N];
+ }
+}