Solved 1137

Author: guangsheng.li01

src/a1137_n_th_tribonacci_number.rs

@@ -0,0 +1,30 @@
+/*
+ * [1137] n-th-tribonacci-number
+ */
+
+struct Solution;
+
+impl Solution {
+    pub fn tribonacci(n: i32) -> i32 {
+        let mut dp: [i32; 38] = [0; 38];
+        dp[0] = 0;
+        dp[1] = 1;
+        dp[2] = 1;
+        for i in 3..(n + 1) as usize {
+            dp[i] = dp[i - 1] + dp[i - 2] + dp[i - 3];
+        }
+        dp[n as usize]
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_case0() {
+        assert_eq!(Solution::tribonacci(4), 4);
+        assert_eq!(Solution::tribonacci(25), 1389537);
+        assert_eq!(Solution::tribonacci(30), 29249425);
+    }
+}

src/lib.rs

@@ -51,6 +51,7 @@ mod a1012_numbers_with_repeated_digits;
 mod a1018_binary_prefix_divisible_by_5;
 mod a1021_remove_outermost_parentheses;
 mod a1047_remove_all_adjacent_duplicates_in_string;
+mod a1137_n_th_tribonacci_number;
 mod a1200_minimum_absolute_difference;
 mod a1287_element_appearing_more_than_25_in_sorted_array;
 mod a1302_deepest_leaves_sum;