add: leetcode 0794 solution

leetcode/0794.Valid-Tic-Tac-Toe-State/794.Valid Tic-Tac-Toe State.go

@@ -0,0 +1,40 @@
+package leetcode
+
+func validTicTacToe(board []string) bool {
+	cntX, cntO := 0, 0
+	for i := range board {
+		for j := range board[i] {
+			if board[i][j] == 'X' {
+				cntX++
+			} else if board[i][j] == 'O' {
+				cntO++
+			}
+		}
+	}
+	if cntX < cntO || cntX > cntO+1 {
+		return false
+	}
+	if cntX == cntO {
+		return process(board, 'X')
+	}
+	return process(board, 'O')
+}
+
+func process(board []string, c byte) bool {
+	//某一行是"ccc"
+	if board[0] == string([]byte{c, c, c}) || board[1] == string([]byte{c, c, c}) || board[2] == string([]byte{c, c, c}) {
+		return false
+	}
+	//某一列是"ccc"
+	if (board[0][0] == c && board[1][0] == c && board[2][0] == c) ||
+		(board[0][1] == c && board[1][1] == c && board[2][1] == c) ||
+		(board[0][2] == c && board[1][2] == c && board[2][2] == c) {
+		return false
+	}
+	//某一对角线是"ccc"
+	if (board[0][0] == c && board[1][1] == c && board[2][2] == c) ||
+		(board[0][2] == c && board[1][1] == c && board[2][0] == c) {
+		return false
+	}
+	return true
+}