diff --git "a/Ukj0ng/202511/03 BOJ G2 \353\241\234\353\264\207 \354\241\260\354\242\205\355\225\230\352\270\260.md" "b/Ukj0ng/202511/03 BOJ G2 \353\241\234\353\264\207 \354\241\260\354\242\205\355\225\230\352\270\260.md" new file mode 100644 index 00000000..1ff6f68c --- /dev/null +++ "b/Ukj0ng/202511/03 BOJ G2 \353\241\234\353\264\207 \354\241\260\354\242\205\355\225\230\352\270\260.md" @@ -0,0 +1,70 @@ +``` +import java.io.*; +import java.util.*; + +public class Main { + private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); + private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out)); + private static int[][] map; + private static int[][][] dp; + private static int N, M; + + public static void main(String[] args) throws IOException { + init(); + DP(); + + bw.write(Math.max(dp[N][M][0], Math.max(dp[N][M][1], dp[N][M][2])) + "\n"); + bw.flush(); + bw.close(); + br.close(); + } + + private static void init() throws IOException { + StringTokenizer st = new StringTokenizer(br.readLine()); + N = Integer.parseInt(st.nextToken()); + M = Integer.parseInt(st.nextToken()); + + map = new int[N+1][M+1]; + dp = new int[N+1][M+1][3]; + + for (int i = 0; i <= N; i++) { + for (int j = 0; j <= M; j++) { + Arrays.fill(dp[i][j], Integer.MIN_VALUE / 2); + } + } + + for (int i = 1; i <= N; i++) { + st = new StringTokenizer(br.readLine()); + for (int j = 1; j <= M; j++) { + map[i][j] = Integer.parseInt(st.nextToken()); + } + } + + dp[1][1][0] = map[1][1]; + dp[1][1][1] = map[1][1]; + dp[1][1][2] = map[1][1]; + } + + private static void DP() { + for (int i = 2; i <= M; i++) { + dp[1][i][1] = dp[1][i-1][1] + map[1][i]; + } + + for (int i = 2; i <= N; i++) { + for (int j = 1; j <= M; j++) { + dp[i][j][0] = Math.max(dp[i-1][j][0], Math.max(dp[i-1][j][1], dp[i-1][j][2])) + map[i][j]; + } + + dp[i][1][1] = dp[i][1][0]; + for (int j = 2; j <= M; j++) { + dp[i][j][1] = Math.max(dp[i][j][0], dp[i][j-1][1] + map[i][j]); + } + + dp[i][M][2] = dp[i][M][0]; + for (int j = M-1; j >= 1; j--) { + dp[i][j][2] = Math.max(dp[i][j][0], dp[i][j+1][2] + map[i][j]); + } + } + } +} +```