B - Card Trick

https://codeforces.com/contest/1681/submission/158175100

Codeforces/1681/B/B.cpp

@@ -0,0 +1,37 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 2e5 + 5;
+
+int t, n, m, a[N];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> t;
+
+    while (t--) {
+        long long t = 0;
+
+        cin >> n;
+
+        for (int i = 1; i <= n; i++) {
+            cin >> a[i];
+        }
+
+        cin >> m;
+
+        for (int i = 1, x; i <= m; i++) {
+            cin >> x;
+
+            t += x;
+        }
+
+        cout << a[t % n + 1] << endl;
+    }
+
+    return 0;
+}