Create: 1137-n-th-tribonacci-number

Author: AkifhanIlgaz

go/1137-n-th-tribonacci-number.go

@@ -0,0 +1,29 @@
+package main
+
+func main() {
+
+}
+
+func tribonacci(n int) int {
+	t := [3]int{0, 1, 1}
+
+	if n < 3 {
+		return t[n]
+	}
+
+	for i := 3; i < n+1; i++ {
+		t[0], t[1], t[2] = t[1], t[2], sum(t)
+	}
+
+	return t[2]
+}
+
+func sum(arr [3]int) int {
+	total := 0
+
+	for _, val := range arr {
+		total += val
+	}
+
+	return total
+}

javascript/1137-n-th-tribonacci-number.js

@@ -0,0 +1,19 @@
+/**
+ * @param {number} n
+ * @return {number}
+ */
+var tribonacci = function (n) {
+    let t = [0, 1, 1];
+
+    if (n < 3) return t[n];
+
+    for (let i = 3; i < n + 1; i++) {
+        [t[0], t[1], t[2]] = [t[1], t[2], sum(t)];
+    }
+
+    return t[2];
+};
+
+function sum(arr) {
+    return arr.reduce((a, b) => a + b);
+}

rust/1137-n-th-tribonacci-number.rs

@@ -0,0 +1,17 @@
+impl Solution {
+    pub fn tribonacci(n: i32) -> i32 {
+        let mut t = [0, 1, 1];
+
+        if n <= 2 {
+            return t[n as usize];
+        }
+
+        for i in 3..(n + 1) as usize {
+            t.swap(0, 1);
+            t.swap(1, 2);
+            t[2] = t.iter().sum();
+        }
+
+        t[2]
+    }
+}

typescript/1137-n-th-tribonacci-number.ts

@@ -0,0 +1,15 @@
+function tribonacci(n: number): number {
+    let t = [0, 1, 1];
+
+    if (n < 3) return t[n];
+
+    for (let i = 3; i < n + 1; i++) {
+        [t[0], t[1], t[2]] = [t[1], t[2], sum(t)];
+    }
+
+    return t[2];
+}
+
+function sum(arr: number[]): number {
+    return arr.reduce((a, b) => a + b);
+}