word-search solution

Author: prgmr99

word-search/prgmr99.js

@@ -0,0 +1,46 @@
+/**
+ * @param {character[][]} board
+ * @param {string} word
+ * @return {boolean}
+ */
+var exist = function (board, word) {
+  const m = board.length;
+  const n = board[0].length;
+
+  const dfs = (row, col, index) => {
+    if (index === word.length) return true;
+
+    if (
+      row < 0 ||
+      row >= m ||
+      col < 0 ||
+      col >= n ||
+      board[row][col] !== word[index]
+    ) {
+      return false;
+    }
+
+    const temp = board[row][col];
+    board[row][col] = "#";
+
+    const found =
+      dfs(row + 1, col, index + 1) ||
+      dfs(row - 1, col, index + 1) ||
+      dfs(row, col + 1, index + 1) ||
+      dfs(row, col - 1, index + 1);
+
+    board[row][col] = temp;
+
+    return found;
+  };
+
+  for (let r = 0; r < m; r++) {
+    for (let c = 0; c < n; c++) {
+      if (board[r][c] === word[0] && dfs(r, c, 1)) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+};