baekjoon 20260110

code_study/Baekjoon/swift/12015.swift

@@ -0,0 +1,43 @@
+func solve() -> Int {
+    guard let N = Int(readLine() ?? ""),
+          let input = readLine()
+    else { return 0 }
+    
+    let A: [Int] = input.split(separator: " ").compactMap{Int($0)}
+    if A.count != N { return -1 }
+    
+    var LIS: [Int] = []
+    
+    for now in A {
+        if LIS.isEmpty {
+            LIS.append(A[0])
+            continue
+        }
+        
+        guard let lastNum: Int = LIS.last else { break }
+        
+        if lastNum < now {
+            LIS.append(now)
+        }
+        else {
+            var l = 0, r = LIS.count-1
+            
+            while l < r {
+                let mid: Int = (l+r)/2
+                
+                if LIS[mid] < now {
+                    l = mid + 1
+                }
+                else {
+                    r = mid
+                }
+            }
+            
+            LIS[l] = now
+        }
+    }
+
+    return LIS.count
+}
+
+print(solve())