diff --git a/README.md b/README.md
index 4844cfd..b8bbf1b 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,9 @@ yenru0 code storage
  Kotlin | kotlin | .kt
  Lua | lua | .lua
 
+* C++17
+* C99
+
 ## completed or incompleted
 내가 **납득**되거나 내가 해결한 문제는 `/completed`로 이동됩니다. ~~관짝~~
 
diff --git a/zeta_cpp/1920.cpp b/zeta_cpp/1920.cpp
new file mode 100644
index 0000000..9f55d8d
--- /dev/null
+++ b/zeta_cpp/1920.cpp
@@ -0,0 +1,49 @@
+#include <iostream>
+#include <algorithm>
+
+using namespace std;
+
+bool isExist(int x, int L[], int size) { // binsearch
+    int begin = 0;
+    int end = size - 1;
+    int mid;
+    int sep;
+    while (begin <= end) {
+        mid = (begin + end) / 2;
+        sep = L[mid];
+        if (x == sep) {
+            return true;
+        } else if (x < sep) {
+            end = mid - 1;
+        } else {
+            begin = mid + 1;
+        }
+    }
+    return false;
+}
+
+int main() {
+    int N, M;
+    ios::sync_with_stdio(0);
+    cin.tie(NULL);
+    cout.tie(NULL);
+    cin >> N;
+    int A[N];
+    for (int i = 0; i < N; i++) {
+        cin >> A[i];
+    }
+    sort(A, A + N);
+
+    cin >> M;
+    int x;
+    for (int i = 0; i < M; i++) {
+        cin >> x;
+        if (isExist(x, A, N)) {
+            cout << "1\n";
+        } else {
+            cout << "0\n";
+        }
+
+    }
+    return 0;
+}
\ No newline at end of file