[20250815] BOJ / G5 / 같은 나머지 / 김수연

suyeun84/202508/15 BOJ G5 같은 나머지.md

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+```java
+import java.io.*;
+import java.util.*;
+
+public class boj1684 {
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static StringTokenizer st;
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+
+	public static void main(String[] args) throws Exception {
+		nextLine();
+		int n = nextInt();
+        int[] arr = new int[n];
+        nextLine();
+        for (int i = 0; i < n; i++) arr[i] = nextInt();
+        Arrays.sort(arr);
+        int min = arr[0];
+        int i = 0;
+        for (i = 0; i < n; i++) if ((arr[i] -= min) != 0) break;
+        if (i == n) {
+            System.out.println(min);
+            return;
+        }
+        int gcd = arr[i++];
+        for (; i < n; i++) gcd = gcd(gcd, arr[i]-=min);
+        System.out.println(gcd);
+	}
+
+	static int gcd(int a, int b) {
+        int r = -1;
+        while (r!=0) {
+            r = a % b;
+            a = b;
+            b = r;
+        }
+        return a;
+    }
+}
+```