Create 1937.cpp

Author: encrypted-def

Appendix E/1937.cpp

@@ -0,0 +1,49 @@
+// http://boj.kr/4bfcd3c7db0441df9e6c8317af3672ab
+#include <bits/stdc++.h>
+using namespace std;
+
+int dx[4] = {1, 0, -1, 0};
+int dy[4] = {0, 1, 0, -1};
+
+int d[505][505];
+int board[505][505];
+int n;
+
+bool OOB(int i, int j){
+  return i < 0 || i >= n || j < 0 || j >= n;
+}
+
+int go(int x, int y){
+  if(d[x][y] != -1)
+    return d[x][y];
+  
+  d[x][y] = 1;
+  for(int dir = 0; dir < 4; dir++){
+    int nx = x + dx[dir];
+    int ny = y + dy[dir];
+    if(OOB(nx, ny) || board[x][y] >= board[nx][ny]) continue;
+    d[x][y] = max(d[x][y], go(nx, ny) + 1);
+  }
+  return d[x][y];
+}
+
+int main(void) {
+  ios::sync_with_stdio(0);
+  cin.tie(0);
+
+  cin >> n;
+  for(int i = 0; i < n; i++){
+    for(int j = 0; j < n; j++){
+      cin >> board[i][j];
+      d[i][j] = -1;
+    }
+  }
+  
+  int mx = 0;
+  for(int i = 0; i < n; i++){
+    for(int j = 0; j < n; j++)
+      mx = max(mx, go(i, j));
+  }
+
+  cout << mx << '\n';
+}