baekjoon 20260306

code_study/Baekjoon/swift/10775.swift

@@ -0,0 +1,37 @@
+func solve() -> Int {
+    guard let G: Int = Int(readLine() ?? ""),
+          let P: Int = Int(readLine() ?? "")
+    else { return 0 }
+
+    var root: [Int] = Array(0...G)
+    
+    func find(_ x: Int) -> Int {
+        if x != root[x] {
+            root[x] = find(root[x])
+        }
+        return root[x]
+    }
+    
+    func union(_ x: Int, _ y: Int) {
+        root[find(y)] = find(x)
+    }
+    
+    var ans: Int = 0
+    
+    for _ in 0..<P {
+        guard let g: Int = Int(readLine() ?? "") else { break }
+        
+        let target = find(g)
+        
+        if target == 0 {
+            break
+        }
+        
+        ans += 1
+        union(target - 1, target)
+    }
+    
+    return ans
+}
+
+print(solve())

code_study/Baekjoon/swift/2754.swift

@@ -0,0 +1,7 @@
+let s = readLine()!
+let (g, p) = (s.first!, s.last!)
+
+let grade: [Character: Float] = ["A" : 4.0, "B" : 3.0, "C" : 2.0, "D" : 1.0, "F" : 0.0]
+let point: [Character: Float] = ["+" : 0.3, "0" : 0.0, "-" : -0.3]
+
+print(grade[g]! + (point[p] ?? 0.0))