diff --git a/src/week3/BOJ17071/BOJ17071_V3.cpp b/src/week3/BOJ17071/BOJ17071_V3.cpp
new file mode 100644
index 0000000..7f0fc0c
--- /dev/null
+++ b/src/week3/BOJ17071/BOJ17071_V3.cpp
@@ -0,0 +1,41 @@
+#include <bits/stdc++.h>
+using namespace std;
+int visited[2][500001];
+int subin, bro;
+int main() {
+
+    ios_base::sync_with_stdio(false);
+    cin.tie(NULL);
+    cout.tie(NULL);
+
+    cin >> subin >> bro;
+
+    queue<int> q;
+    q.push(subin);
+    visited[0][subin] = 1;
+    int t=0;
+    while(!q.empty()) {
+        int qsize = q.size();
+        while (qsize--) {
+            subin = q.front();
+            q.pop();
+            int bro_pos = bro + ((t * (t+1)) / 2);
+            if (bro_pos > 500000) break;
+
+            if (visited[t%2][bro_pos]) {
+                cout << t << '\n';
+                return 0;
+            }
+            for (int next : {subin -1, subin + 1, subin * 2}) {
+                if (next < 0 || next >500000 || visited[(t+1)%2][next]) continue;
+                q.push(next);
+                visited[(t+1)%2][next] = 1;
+            }
+        }
+        t++;
+    }
+
+    cout << -1 << '\n';
+
+    return 0;
+}
\ No newline at end of file