diff --git "a/khj20006/202502/20 BOJ G4 \352\260\231\354\235\200 \354\210\230\353\241\234 \353\247\214\353\223\244\352\270\260.md" "b/khj20006/202502/20 BOJ G4 \352\260\231\354\235\200 \354\210\230\353\241\234 \353\247\214\353\223\244\352\270\260.md"
new file mode 100644
index 00000000..525e324b
--- /dev/null
+++ "b/khj20006/202502/20 BOJ G4 \352\260\231\354\235\200 \354\210\230\353\241\234 \353\247\214\353\223\244\352\270\260.md"	
@@ -0,0 +1,36 @@
+```cpp
+
+#include <iostream>
+#include <algorithm>
+#include <stack>
+using namespace std;
+using ll = long long;
+
+int main()
+{
+	cin.tie(0)->sync_with_stdio(0);
+
+	ll N, ans = 0;
+	stack<ll> S;
+	cin >> N;
+	for (int i = 1; i <= N; i++) {
+		ll a;
+		cin >> a;
+		if (!S.empty() && S.top() < a) {
+			ll t = S.top();
+			while (!S.empty() && S.top() < a) S.pop();
+			ans += a - t;
+		}
+		S.push(a);
+	}
+
+	ans -= S.top();
+	ll mx = 0;
+	while (!S.empty()) mx = S.top(), S.pop();
+	ans += mx;
+	
+	cout << ans;
+
+}
+
+```