[20250927] PGM / LV2 / 멀쩡한 사각형 / 김수연

suyeun84/202509/27 PGM LV2 멀쩡한 사각형.md

@@ -0,0 +1,22 @@
+```java
+class Solution {
+	public long solution(int w, int h) {
+		long answer = (long)w * (long)h;
+
+		long wl = (long)w / gcd(w, h);
+		long hl = (long)h / gcd(w, h);
+
+		answer -= (wl + hl - 1) * gcd(w, h); 
+
+		return answer;
+	}
+
+	//최대 공약수 (유클리드 호제법)
+	private static long gcd(long w, long h) {
+		if(h == 0) {
+			return w;
+		}
+		return gcd(h, w % h);
+	}
+}
+```