[20250618] BOJ / G2 / 가장 긴 증가하는 부분 수열 / 이강현

Author: lkhyun

lkhyun/202506/18 BOJ G2 가장 긴 증가하는 부분 수열.md

@@ -0,0 +1,40 @@
+```java
+import java.io.*;
+import java.util.*;
+
+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 int N;
+    static List<Integer> LIS;
+
+    public static void main(String[] args) throws IOException {
+        N = Integer.parseInt(br.readLine());
+        LIS = new ArrayList<>();
+        st = new StringTokenizer(br.readLine());
+        for (int i = 0; i < N; i++) {
+            int cur = Integer.parseInt(st.nextToken());
+            if(LIS.isEmpty() || LIS.get(LIS.size()-1) < cur){
+                LIS.add(cur);
+            }else{
+                LIS.set(binarySearch(cur),cur);
+            }
+        }
+        bw.write(LIS.size() + "\n");
+        bw.close();
+    }
+    public static int binarySearch(int target) {
+        int left = 0; int right = LIS.size() - 1;
+        while(left < right){
+            int mid = (left + right) / 2;
+            if(LIS.get(mid) < target){
+                left = mid + 1;
+            }else{
+                right = mid;
+            }
+        }
+        return left;
+    }
+}
+```