diff --git a/jiyunpar/binary_search/1920.cpp b/jiyunpar/binary_search/1920.cpp
new file mode 100644
index 0000000..8b2d8cd
--- /dev/null
+++ b/jiyunpar/binary_search/1920.cpp
@@ -0,0 +1,58 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+int n, m;
+vector<int> seq;
+vector<int> target;
+
+int binarysearch(int i)
+{
+	int start, end, mid;
+	start = 0;
+	end = n -1;
+	while (start <= end)
+	{
+		mid = (start + end) / 2;
+		if (seq[mid] < target[i])
+			start = mid + 1;
+		else if (seq[mid] > target[i])
+			end = mid - 1;
+		else
+			return (1);
+	}
+	return (0);
+}
+
+int main(void)
+{
+	ios::sync_with_stdio(0);
+	cin.tie(0);
+	seq.reserve(100000);
+	target.reserve(100000);
+	cin >> n;
+	for (int i = 0; i < n; ++i)
+	{
+		int val;
+		cin >> val;
+		seq.push_back(val);
+	}
+	cin >> m;
+	for (int i = 0; i < m; ++i)
+	{
+		int val;
+		cin >> val;
+		target.push_back(val);
+	}
+	sort(seq.begin(), seq.end());
+	for (int i = 0; i < m; ++i)
+	{
+		if (binarysearch(i))
+			cout << 1 << '\n';
+		else
+			cout << 0 << '\n';
+	}
+	return (0);
+}
\ No newline at end of file
diff --git a/jiyunpar/binary_search/1920_1.cpp b/jiyunpar/binary_search/1920_1.cpp
new file mode 100644
index 0000000..d59051c
--- /dev/null
+++ b/jiyunpar/binary_search/1920_1.cpp
@@ -0,0 +1,41 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+int n, m;
+vector<int> seq;
+vector<int> target;
+
+// using STL binary_search
+int main(void)
+{
+	ios::sync_with_stdio(0);
+	cin.tie(0);
+	seq.reserve(100000);
+	target.reserve(100000);
+	cin >> n;
+	for (int i = 0; i < n; ++i)
+	{
+		int val;
+		cin >> val;
+		seq.push_back(val);
+	}
+	cin >> m;
+	for (int i = 0; i < m; ++i)
+	{
+		int val;
+		cin >> val;
+		target.push_back(val);
+	}
+	sort(seq.begin(), seq.end());
+	for (int i = 0; i < m; ++i)
+	{
+		if (binary_search(seq.begin(), seq.end(), target[i]))
+			cout << 1 << '\n';
+		else
+			cout << 0 << '\n';
+	}
+	return (0);
+}
\ No newline at end of file