[20251108] BOJ / G5 / 제곱수 찾기 / 김수연

suyeun84/202511/08 BOJ G5 제곱수 찾기.md

@@ -0,0 +1,54 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+	public static int N, M;
+	public static int[][] map;
+	public static String S, T;
+	public static int result = -1;
+    public static void main(String[] args) throws IOException{
+    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+    	StringTokenizer st = new StringTokenizer(br.readLine());
+    	N = Integer.parseInt(st.nextToken());
+    	M = Integer.parseInt(st.nextToken());
+
+    	map = new int[N][M];
+    	for(int i=0;i<N;i++) {
+    		String s = br.readLine();
+    		for(int j=0;j<M;j++) {
+    			map[i][j] = Integer.parseInt(String.valueOf(s.charAt(j)));	
+    		}
+    	}
+
+    	for(int i=0;i<N;i++) {
+    		for(int j=0;j<M;j++) {
+    			for(int di =-N; di<N;di++){
+    				for(int dj = -M; dj<M;dj++) { 
+
+    					if(di == 0 && dj == 0) {
+    						continue;
+    					}
+
+    					int nI = i;
+    					int nJ = j;
+    					int now = 0;
+    					while( nI >= 0 && nI < N && nJ >= 0 && nJ < M) {
+    						now *= 10;
+    						now += map[nI][nJ];
+
+    						int sqrt_check = (int) Math.sqrt( (double) now);
+    						if( sqrt_check * sqrt_check == now) result = Math.max(result, now);
+
+    						nI += di;
+    						nJ += dj;
+    					}
+    				}
+    			}
+    		}
+    	}
+    	System.out.println(result);
+    }  
+}
+```