20250821 baekjoon

code_study/Baekjoon/c/14500.c

@@ -0,0 +1,84 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+int max(int a, int b);
+void dfs(int** arr, bool** visited, int x, int y, int n, int m, int currentSum, int* currentMax, int depth);
+void T_block_Search(int** arr, int n, int m, int* currentMax);
+
+int main(){
+    int N, M;
+    scanf("%d %d",&N, &M);
+    int** canvas = (int**)malloc(sizeof(int*)*N);
+    bool** visited = (bool**)malloc(sizeof(bool*)*N);
+    for(int i=0; i<N; i++){
+        canvas[i] = (int*)malloc(sizeof(int)*M);
+        visited[i] = (bool*)malloc(sizeof(bool)*M);
+        for(int j=0; j<M; j++){
+            scanf("%d",&canvas[i][j]);
+            visited[i][j] = false;
+        }
+    }
+
+    int maxValue = 0;
+    for(int x=0; x<M; x++){
+        for(int y=0; y<N; y++){
+            visited[y][x] = true;
+            dfs(canvas, visited, x, y, N, M, canvas[y][x], &maxValue, 1);
+            visited[y][x] = false;
+        }
+    }
+    
+    T_block_Search(canvas, N, M, &maxValue);
+    
+    printf("%d\n",maxValue);
+    
+    for(int i=0; i<N; i++){
+        free(canvas[i]);
+        free(visited[i]);
+    }
+    free(canvas);
+    free(visited);
+
+    return 0;
+}
+
+int max(int a, int b){
+    return (a>b) ? a : b;
+}
+
+void dfs(int** arr, bool** visited, int x, int y, int n, int m, int currentSum, int* currentMax, int depth){
+    if(depth==4) {
+        *currentMax = max(currentSum, *currentMax);
+        return;
+    }
+
+    int dx[4] = {1,-1,0,0};
+    int dy[4] = {0,0,1,-1};
+
+    for(int i=0; i<4; i++){
+        int nx = x + dx[i];
+        int ny = y + dy[i];
+        
+        if(nx<0 || ny<0 || nx>=m || ny>=n || visited[ny][nx]) continue;
+
+        visited[ny][nx] = true;
+        dfs(arr, visited, nx, ny, n, m, currentSum + arr[ny][nx], currentMax, depth + 1);
+        visited[ny][nx] = false;
+    }
+}
+
+void T_block_Search(int** arr, int n, int m, int* currentMax){
+    for(int y=0; y<n; y++){
+        for(int x=0; x<m; x++){
+            //ㅏ
+            if(x+1<m && y>=1 && y+1<n) *currentMax = max(*currentMax, arr[y][x]+arr[y][x+1]+arr[y-1][x]+arr[y+1][x]);
+            //ㅜ
+            if(x>=1 && x+1<m && y+1<n) *currentMax = max(*currentMax, arr[y][x]+arr[y][x+1]+arr[y][x-1]+arr[y+1][x]);
+            //ㅓ
+            if(x>=1 && y>=1 && y+1<n) *currentMax = max(*currentMax, arr[y][x]+arr[y][x-1]+arr[y-1][x]+arr[y+1][x]);
+            //ㅗ
+            if(x>=1 && x+1<m && y>=1) *currentMax = max(*currentMax, arr[y][x]+arr[y][x+1]+arr[y][x-1]+arr[y-1][x]);
+        }
+    }
+}