@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+using namespace std;
+int main() {
+
+ vector<int> a;
+ int q;
+ cin >> q;
+ while (q--) {
+ int op;
+ cin >> op;
+ if (op == 0) {
+ int x;
+ cin >> x;
+ a.push_back(x);
+ } else if (op == 1) {
+ int p;
+ cin >> p;
+ cout << a[p] << endl;
+ } else {
+ a.pop_back();
+ }
+ return 0;
+}
