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-rw-r--r--introductory_problems/tower_of_hanoi.cpp21
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diff --git a/introductory_problems/tower_of_hanoi.cpp b/introductory_problems/tower_of_hanoi.cpp
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+++ b/introductory_problems/tower_of_hanoi.cpp
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+// 2165. Tower of Hanoi
+#include <bits/stdc++.h>
+using namespace std;
+
+void move(int from, int to, int depth) {
+ if (depth == 1) {
+ printf("%d %d\n", from, to);
+ return;
+ }
+ int other = 6 - from - to;
+ move(from, other, depth - 1);
+ printf("%d %d\n", from, to);
+ move(other, to, depth - 1);
+}
+
+int main() {
+ static int n;
+ scanf("%d", &n);
+ printf("%d\n", (1 << n) - 1);
+ move(1, 3, n);
+}