Merge pull request #859 from AlgorithmWithGod/lkhyun

[20250910] BOJ / G1 / 제곱 ㄴㄴ수 / 이강현

Author: ShinHeeEul

lkhyun/202509/10 BOJ G1 제곱 ㄴㄴ수.md

@@ -0,0 +1,44 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main{
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static StringBuilder sb = new StringBuilder();
+    static long min,max;
+    static List<Long> squares;
+    static long cnt;
+    public static void main(String[] args) throws Exception {
+        st = new StringTokenizer(br.readLine());
+        min = Long.parseLong(st.nextToken());
+        max = Long.parseLong(st.nextToken());
+        squares = new ArrayList<>();
+        cnt = max-min+1;
+
+        long temp = 2;
+        while(temp*temp<=max){ //제곱수 저장
+            squares.add(temp*temp);
+            temp++;
+        }
+
+        Set<Long> s = new HashSet<>();
+
+        for (long cur : squares) {
+            long init = min/cur;
+            long result = cur*init++;
+            if(min%cur == 0) s.add(result);
+            result = cur*init;
+            while(result<=max){
+                s.add(result);
+                result = ++init * cur;
+            }
+        }
+
+        bw.write((cnt - s.size())+"");
+        bw.close();
+    }
+
+}
+```