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79-Word-Search.js
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79-Word-Search.js
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function dfs(board, i, j, remain) {
if (remain === "") return true;
if (i < 0 || i >= board.length || j < 0 || j >= board[0].length) return false;
if (board[i][j] !== remain[0]) return false;
let temp = board[i][j];
board[i][j] = "-";
let result = (
dfs(board, i - 1, j, remain.slice(1))
|| dfs(board, i + 1, j, remain.slice(1))
|| dfs(board, i, j - 1, remain.slice(1))
|| dfs(board, i, j + 1, remain.slice(1))
)
board[i][j] = temp;
return result;
}
var exist = function (board, word) {
for (let i = 0; i < board.length; i++) {
for (let j = 0; j < board[0].length; j++) {
if (dfs(board, i, j, word)) {
return true;
}
}
}
return false;
};