diff --git "a/zinnnn37/202511/26 BOJ G4 \354\232\260\354\234\240 \353\217\204\354\213\234.md" "b/zinnnn37/202511/26 BOJ G4 \354\232\260\354\234\240 \353\217\204\354\213\234.md" new file mode 100644 index 00000000..31ff40c1 --- /dev/null +++ "b/zinnnn37/202511/26 BOJ G4 \354\232\260\354\234\240 \353\217\204\354\213\234.md" @@ -0,0 +1,71 @@ +```java +import java.io.*; +import java.util.StringTokenizer; + +public class BJ_14722_우유_도시 { + + private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); + private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out)); + private static StringTokenizer st; + + private static int N; + private static int[][] milk; + private static Milk[][] dp; + + private static class Milk { + int prev; + int cnt; + + Milk(int prev, int cnt) { + this.prev = prev; + this.cnt = cnt; + } + } + + public static void main(String[] args) throws IOException { + init(); + sol(); + } + + private static void init() throws IOException { + N = Integer.parseInt(br.readLine()); + + milk = new int[N + 1][N + 1]; + dp = new Milk[N + 1][N + 1]; + + for (int i = 1; i <= N; i++) { + st = new StringTokenizer(br.readLine()); + for (int j = 1; j <= N; j++) { + milk[i][j] = Integer.parseInt(st.nextToken()); + } + } + + for (int i = 0; i <= N; i++) { + for (int j = 0; j <= N; j++) { + dp[i][j] = new Milk(0, 0); + } + } + } + + private static void sol() throws IOException { + for (int i = 1; i <= N; i++) { + for (int j = 1; j <= N; j++) { + Milk fromUp = dp[i - 1][j]; + Milk fromLeft = dp[i][j - 1]; + Milk better = fromUp.cnt >= fromLeft.cnt ? fromUp : fromLeft; + + if (milk[i][j] == better.prev) { + dp[i][j] = new Milk((better.prev + 1) % 3, better.cnt + 1); + } else { + dp[i][j] = new Milk(better.prev, better.cnt); + } + } + } + + bw.write(dp[N][N].cnt + ""); + bw.flush(); + bw.close(); + br.close(); + } +} +``` \ No newline at end of file