[20250205] BOJ / 골드2 / 등산 / 이강현

lkhyun/202502/05 BOJ 골드2 등산.md

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+```java
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.util.*;
+
+public class Main {
+    static BufferedReader br;
+    static BufferedWriter bw;
+    public static void main(String[] args) throws Exception {
+        br = new BufferedReader(new InputStreamReader(System.in));
+        bw = new BufferedWriter(new OutputStreamWriter(System.out));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        int N = Integer.parseInt(st.nextToken());
+        int M = Integer.parseInt(st.nextToken());
+        int T = Integer.parseInt(st.nextToken());
+        int D = Integer.parseInt(st.nextToken());
+
+        int[][] map = new int[N][M];
+        for(int n=0;n<N;n++){
+            int temp=0;
+            for(char c : br.readLine().toCharArray()){
+                if(c>=97 && c<=122){
+                    map[n][temp++] = c-'a' + 26;
+                }
+                else{
+                    map[n][temp++] += c-'A';
+                }
+            }
+        }
+
+        long[][] shortpath = new long[N*M][N*M];
+        for(int i=0;i<N*M;i++){
+            Arrays.fill(shortpath[i],Integer.MAX_VALUE);
+            shortpath[i][i] = 0;
+        }
+        //상하좌우 순서서
+        int[] dx = {0,0,-1,1};
+        int[] dy = {-1,1,0,0};
+
+        for(int i=0;i<N;i++){
+            for(int j=0;j<M;j++){
+                for(int m=0;m<4;m++){
+                    int newi = i + dy[m];
+                    int newj = j + dx[m];
+                    if(newi >= 0 && newi < N && newj >= 0 && newj < M){
+                        int height = map[newi][newj] - map[i][j];
+                        if(Math.abs((double)height) > T){continue;}
+                        if(height >= 0){//높은 곳에서 아래로 이동
+                            shortpath[newi*M+newj][i*M+j] = 1;
+                            shortpath[i*M+j][newi*M+newj] = (int)Math.pow(height,2);
+                        }
+                        else{
+                            shortpath[newi*M+newj][i*M+j] = (int)Math.pow(height,2);
+                            shortpath[i*M+j][newi*M+newj] = 1;
+                        }
+
+                    }
+                }      
+            }
+        }
+        for(int x=0;x<N;x++){
+            for(int y=0;y<M;y++){
+                for(int i=0;i<N;i++){
+                    for(int j=0;j<M;j++){
+                        for(int k=0;k<N;k++){
+                            for(int l=0;l<M;l++){
+                                shortpath[i*M+j][k*M+l] = Math.min(shortpath[i*M+j][k*M+l],shortpath[i*M+j][x*M+y] + shortpath[x*M+y][k*M+l]); 
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        int max = map[0][0];
+        for(int i=0;i<N;i++){
+            for(int j=0;j<M;j++){
+                if(shortpath[0][i*M+j] + shortpath[i*M+j][0] <= D){
+                    max = Math.max(max,map[i][j]);
+                }
+            }
+        }
+        bw.write(max+"");
+        bw.flush();
+    }
+}
+
+```