From bad8a6f6ff51572fbc6556909c684a16c0832f57 Mon Sep 17 00:00:00 2001
From: songyc macbook <gitea@gitea>
Date: Sun, 17 Aug 2025 22:31:44 +0900
Subject: [PATCH] 20250817 baekjoon

---
 code_study/Baekjoon/swift/16928.swift | 90 +++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 code_study/Baekjoon/swift/16928.swift

diff --git a/code_study/Baekjoon/swift/16928.swift b/code_study/Baekjoon/swift/16928.swift
new file mode 100644
index 0000000..cf8d8f3
--- /dev/null
+++ b/code_study/Baekjoon/swift/16928.swift
@@ -0,0 +1,90 @@
+public struct Deque<T> {
+    private var front: [T] = []
+    private var back: [T] = []
+
+    public var isEmpty: Bool {
+        return front.isEmpty && back.isEmpty
+    }
+
+    public var count: Int {
+        return front.count + back.count
+    }
+
+    public mutating func append(_ element: T) {
+        back.append(element)
+    }
+
+    public mutating func prepend(_ element: T) {
+        front.append(element)
+    }
+
+    public mutating func popFirst() -> T? {
+        if front.isEmpty {
+            front = back.reversed()
+            back.removeAll()
+        }
+        return front.popLast()
+    }
+
+    public mutating func popLast() -> T? {
+        if back.isEmpty {
+            back = front.reversed()
+            front.removeAll()
+        }
+        return back.popLast()
+    }
+}
+
+if let input = readLine(),
+   let nm = {
+        let numList = input.split(separator : " ").compactMap({Int($0)})
+        return numList.count==2 ? numList : nil
+    }() as [Int]? {
+        let N = nm[0]
+        let M = nm[1]
+        var q: Deque<(Int, Int)> = Deque()
+        var snake_ladder: [Int: Int] = Dictionary(uniqueKeysWithValues: zip(1...100, 1...100))
+        var visited: [Bool] = Array(repeating: false, count: 101)
+
+        for _ in 0..<N+M {
+            if let line = readLine(),
+               let uv = {
+                   let numList = line.split(separator: " ").compactMap({Int($0)})
+                   return numList.count==2 ? numList : nil
+               }() as [Int]? {
+                snake_ladder[uv[0]] = uv[1]
+            }
+            else {
+                print("error U, V or X, Y")
+            }
+        }
+
+        var current, dice : Int
+        q.append((1,0))
+        visited[1] = true
+        while q.count != 0 {
+            if let currentTuple = q.popFirst() {
+                current = currentTuple.0
+                dice = currentTuple.1
+                if current == 100 {
+                    print(dice )
+                    break
+                }
+                for n in 1...6 {
+                    if current + n <= 100, !visited[current+n], let next = snake_ladder[current + n] {
+                        q.append((next, dice + 1))
+                        visited[next] = true
+                    }
+                    else {
+                        continue
+                    }
+                }
+            }
+            else {
+                continue
+            }
+        }
+}
+else {
+    print("error N, M")
+}
\ No newline at end of file