Create 999-available-captures-for-rook.js

Author: everthis

999-available-captures-for-rook.js

@@ -0,0 +1,18 @@
+/**
+ * @param {character[][]} board
+ * @return {number}
+ */
+const numRookCaptures = function(board) {
+  for (let i = 0; i < board.length; ++i)
+    for (let j = 0; j < board[i].length; ++j)
+      if (board[i][j] == 'R') return cap(board,i,j,0,1)+cap(board,i,j,0,-1)+cap(board,i,j,1,0)+cap(board,i,j,-1,0);
+  return 0;  
+};
+
+function cap(b, x, y, dx, dy) {
+  while (x >= 0 && x < b.length && y >= 0 && y < b[x].length && b[x][y] != 'B') {
+    if (b[x][y] == 'p') return 1;
+    x += dx; y += dy;
+  }
+  return 0;
+}