[20250203] BOJ / 골드2 / 등산 / 권혁준

khj20006/202502/03 BOJ G2 등산.md

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+```java
+
+import java.util.*;
+import java.io.*;
+
+class Main {
+
+	// IO field
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	static StringTokenizer st;
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	static long nextLong() {return Long.parseLong(st.nextToken());}
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+
+	// Additional field
+
+
+	public static void main(String[] args) throws Exception {
+
+		int[] dx = {1,0,-1,0};
+		int[] dy = {0,1,0,-1};
+
+		nextLine();
+		int N = nextInt(), M = nextInt(), T = nextInt(), D = nextInt();
+		int[][] A = new int[N][M];
+		for(int i=0;i<N;i++) {
+			String line = br.readLine();
+			for(int j=0;j<M;j++) {
+				char a = line.charAt(j);
+				if(a <= 'Z') A[i][j] = a-'A';
+				else A[i][j] = a-'a'+26;
+			}
+		}
+
+		int INF = 1234567890;
+		int[][][] dist = new int[N][M][52];
+		for(int i=0;i<N;i++) for(int j=0;j<M;j++) Arrays.fill(dist[i][j], INF);
+		PriorityQueue<int[]> PQ = new PriorityQueue<>((a,b) -> a[0]-b[0]);
+		dist[0][0][A[0][0]] = 0;
+		PQ.offer(new int[] {0,0,0,A[0][0]});
+		while(!PQ.isEmpty()) {
+			int[] now = PQ.poll();
+			int t = now[0], x = now[1], y = now[2], a = now[3];
+			if(t > dist[x][y][a]) continue;
+			for(int i=0;i<4;i++) {
+				int xx = x+dx[i], yy = y+dy[i];
+				if(xx<0 || xx>=N || yy<0 || yy>=M) continue;
+				if(Math.abs(A[x][y] - A[xx][yy]) > T) continue;
+				int aa = Math.max(a, A[xx][yy]);
+				int v = Math.max(1, A[xx][yy] - A[x][y]);
+				if(dist[xx][yy][aa] > t + v*v) {
+					dist[xx][yy][aa] = t+v*v;
+					PQ.offer(new int[] {t+v*v,xx,yy,aa});
+				}
+			}
+		}
+		for(int i=51;i>=0;i--) {
+			if(dist[0][0][i] <= D) {
+				bw.write(i+"\n");
+				bwEnd();
+				return;
+			}
+		}
+
+		bwEnd();
+	}
+
+}
+
+```