Merge pull request #239 from fusunx/master

0051N皇后.md Javascript;0037解数独.md Javascript

problems/0037.解数独.md

@@ -291,7 +291,61 @@ Python：
 
 Go：
 
+Javascript:
+```Javascript
+var solveSudoku = function(board) {
+    function isValid(row, col, val, board) {
+        let len = board.length
+        // 行不能重复
+        for(let i = 0; i < len; i++) {
+            if(board[row][i] === val) {
+                return false
+            }
+        }
+        // 列不能重复
+        for(let i = 0; i < len; i++) {
+            if(board[i][col] === val) {
+                return false
+            }
+        }
+        let startRow = Math.floor(row / 3) * 3
+        let startCol = Math.floor(col / 3) * 3
 
+        for(let i = startRow; i < startRow + 3; i++) {
+            for(let j = startCol; j < startCol + 3; j++) {
+                if(board[i][j] === val) {
+                    return false
+                }
+            }
+        }
+
+        return true
+    }
+
+    function backTracking() {
+        for(let i = 0; i < board.length; i++) {
+            for(let j = 0; j < board[0].length; j++) {
+                if(board[i][j] !== '.') continue
+                for(let val = 1; val <= 9; val++) {
+                    if(isValid(i, j, `${val}`, board)) {
+                        board[i][j] = `${val}`
+                        if (backTracking()) {
+                            return true
+                        }
+                        
+                        board[i][j] = `.`
+                    }
+                }
+                return false
+            }
+        }
+        return true
+    }
+    backTracking(board)
+    return board
+    
+};
+```
 
 
 -----------------------

problems/0051.N皇后.md

@@ -430,6 +430,65 @@ func solveNQueens(n int) [][]string {
 }
 ```
 
+Javascript:
+```Javascript
+var solveNQueens = function(n) {
+    function isValid(row, col, chessBoard, n) {
+
+        for(let i = 0; i < row; i++) {
+            if(chessBoard[i][col] === 'Q') {
+                return false
+            }
+        }
+
+        for(let i = row - 1, j = col - 1; i >= 0 && j >= 0; i--, j--) {
+            if(chessBoard[i][j] === 'Q') {
+                return false
+            }
+        }
+
+        for(let i = row - 1, j = col + 1; i >= 0 && j < n; i--, j++) {
+            if(chessBoard[i][j] === 'Q') {
+                return false
+            }
+        }
+        return true
+    }
+
+    function transformChessBoard(chessBoard) {
+        let chessBoardBack = []
+        chessBoard.forEach(row => {
+            let rowStr = ''
+            row.forEach(value => {
+                rowStr += value
+            })
+            chessBoardBack.push(rowStr)
+        })
+
+        return chessBoardBack
+    }
+
+    let result = []
+    function backtracing(row,chessBoard) {
+        if(row === n) {
+            result.push(transformChessBoard(chessBoard))
+            return
+        }
+        for(let col = 0; col < n; col++) {
+            if(isValid(row, col, chessBoard, n)) {
+                chessBoard[row][col] = 'Q'
+                backtracing(row + 1,chessBoard)
+                chessBoard[row][col] = '.'
+            }
+        }
+    }
+    let chessBoard = new Array(n).fill([]).map(() => new Array(n).fill('.'))
+    backtracing(0,chessBoard)
+    return result
+    
+};
+```
+
 
 
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