diff --git a/src/week5/BOJ13144/BOJ13144_V1.cpp b/src/week5/BOJ13144/BOJ13144_V1.cpp
new file mode 100644
index 0000000..317a5f0
--- /dev/null
+++ b/src/week5/BOJ13144/BOJ13144_V1.cpp
@@ -0,0 +1,33 @@
+#include <bits/stdc++.h>
+using namespace std;
+bool visited[100001];
+int inp[100001];
+long long cnt;
+int main() {
+
+    ios_base::sync_with_stdio(false);
+    cin.tie(nullptr);
+    cout.tie(nullptr);
+
+    int N;
+    cin >> N;
+
+    int st=0;
+    for (int i=0; i<N; i++) {
+        cin >> inp[i];
+    }
+
+    for (int ed=0; ed<N; ed++){
+        while(visited[inp[ed]]) {
+            visited[inp[st]] = false;
+            st++;
+        }
+
+        visited[inp[ed]] = true;
+        cnt += (ed - st + 1);
+    }
+
+    cout << cnt;
+
+    return 0;
+}
\ No newline at end of file