diff --git "a/weekly/week01/BOJ_1920_\354\210\230 \354\260\276\352\270\260/gyuhyeok99.cpp" "b/weekly/week01/BOJ_1920_\354\210\230 \354\260\276\352\270\260/gyuhyeok99.cpp"
new file mode 100644
index 0000000..bf31637
--- /dev/null
+++ "b/weekly/week01/BOJ_1920_\354\210\230 \354\260\276\352\270\260/gyuhyeok99.cpp"	
@@ -0,0 +1,44 @@
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+int n, m, num;
+int a[100001];
+
+bool find(int num, int l, int r) {
+    while(l <= r) {
+        int mid = (l + r) / 2;
+        if(num == a[mid]) {
+            return true;
+        }
+        else if(num > a[mid]) {
+            l = mid + 1;
+        }
+        else {
+            r = mid - 1;
+        }
+    }
+    return false;
+}
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(NULL); cout.tie(NULL);
+
+    cin >> n;
+    for(int i = 0; i < n; i++) {
+        cin >> a[i];
+    }
+    sort(a, a + n);
+    cin >> m;
+    for(int i = 0; i < m; i++) {
+        cin >> num;
+        if(find(num, 0, n - 1)) {
+            cout << 1 << '\n';
+        }
+        else {
+            cout << 0 << '\n';
+        }
+    }
+    return 0;
+}