20251122 baekjoon

code_study/Baekjoon/swift/17404.swift

@@ -0,0 +1,39 @@
+if let N = Int(readLine() ?? "") {
+    var RGB: [[Int]] = []
+    for _ in 0..<N {
+        guard let input = readLine(),
+              let rgb = input.split(separator: " ").compactMap({Int($0)}) as? [Int],
+              rgb.count == 3 else { break }
+        
+        RGB.append(rgb)
+    }
+    
+    let maxCost = 1001
+    var result = Int.max
+    
+    for i in 1...3 {
+        var prevR = i != 1 ? maxCost : RGB[0][0]
+        var prevG = i != 2 ? maxCost : RGB[0][1]
+        var prevB = i != 3 ? maxCost : RGB[0][2]
+        
+        for j in 1..<N {
+            let currentR = RGB[j][0] + min(prevG, prevB)
+            let currentG = RGB[j][1] + min(prevR, prevB)
+            let currentB = RGB[j][2] + min(prevG, prevR)
+            
+            (prevR, prevG, prevB) = (currentR, currentG, currentB)
+        }
+        
+        if i==1 {
+            result = min(result, prevG, prevB)
+        }
+        else if i==2 {
+            result = min(result, prevR, prevB)
+        }
+        else {
+            result = min(result, prevG, prevR)
+        }
+    }
+    
+    print(result)
+}