Create 1137. N-th Tribonacci Number (#464)

Author: Chayandas07

1137. N-th Tribonacci Number

@@ -0,0 +1,12 @@
+class Solution {
+public:
+    int tribonacci(int n) {
+        vector<int>temp={0,1,1};
+        int var=0;
+        for(int i=3;i<n+1;++i){
+           var=temp[i-1]+temp[i-2]+temp[i-3];
+           temp.push_back(var);
+        }
+        return temp[n];
+    }
+};