Create 백준-1940-주몽.java

Author: rhkr8521

2025-08-19/곽태근/백준-1940-주몽.java

@@ -0,0 +1,47 @@
+
+import java.io.*;
+import java.util.*;
+
+public class Main{
+
+    public static void main(String[] args) throws IOException{
+
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+        int N = Integer.parseInt(br.readLine());
+        long M = Long.parseLong(br.readLine());
+
+        int[] j = new int[N];
+
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        for(int i = 0 ; i<N; i++){
+            j[i] = Integer.parseInt(st.nextToken());
+        }
+
+        Arrays.sort(j);
+
+        int start = 0;
+        int end = N -1;
+        int answer = 0;
+
+        while(start < end){
+
+            if(j[start] + j[end] < M){
+                start++;
+            }else if (j[start] + j[end] == M){
+                answer++;
+                start++;
+                end--;
+            }else{
+                end --;
+            }
+
+        }
+
+        bw.write(answer+"");
+        bw.flush();
+
+    }
+}