diff --git a/src/week4/BOJ1285/BOJ1285_V3.cpp b/src/week4/BOJ1285/BOJ1285_V3.cpp
new file mode 100644
index 0000000..0bcc304
--- /dev/null
+++ b/src/week4/BOJ1285/BOJ1285_V3.cpp
@@ -0,0 +1,52 @@
+#include <bits/stdc++.h>
+using namespace std;
+int N;
+int bit_arr[21];
+int ret = INT_MAX;
+int calculate() {
+    int ret_val = 0;
+    for (int i=0; i<N; i++) {
+        int cnt = 0;
+        for (int j=0; j<N; j++) {
+            if (bit_arr[j] & (1 << i))
+                cnt++;
+        }
+        ret_val += min(cnt, N-cnt);
+    }
+
+    return ret_val;
+}
+void solve(int n) {
+    if (n == N) {
+        ret = min(ret, calculate());
+        return;
+    }
+
+    solve(n+1);
+    bit_arr[n] = ~bit_arr[n];
+    solve(n+1);
+    bit_arr[n] = ~bit_arr[n];
+}
+int main() {
+
+    ios_base::sync_with_stdio(false);
+    cin.tie(NULL);
+    cout.tie(NULL);
+
+    cin >> N;
+
+    for (int i = 0; i < N; i++) {
+        string s;
+        cin >> s;
+        int num = 1;
+        for (int j = 0; j < s.length(); j++) {
+            if (s[j] == 'T') bit_arr[i] |= (1 << (num-1));
+            num++;
+        }
+    }
+
+    solve(0);
+
+    cout << ret << '\n';
+    return 0;
+}
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