freeCodeCamp/curriculum/challenges/english/blocks/daily-coding-challenges-python/69373793f5a867f769cde138.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
69373793f5a867f769cde138	Challenge 153: Tic-Tac-Toe	29	challenge-153

--description--

Given a 3×3 matrix (an array of arrays) representing a completed Tic-Tac-Toe game, determine the winner.

• Each element in the given matrix is either an "X" or "O".

A player wins if they have three of their characters in a row - horizontally, vertically, or diagonally.

Return:

• "X wins" if player X has three in a row.
• "O wins" if player O has three in a row.
• "Draw" if no player has three in a row.

--hints--

tic_tac_toe([["X", "X", "X"], ["O", "O", "X"], ["O", "X", "O"]]) should return "X wins".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(tic_tac_toe([["X", "X", "X"], ["O", "O", "X"], ["O", "X", "O"]]), "X wins")`)
}})

tic_tac_toe([["X", "O", "X"], ["X", "O", "X"], ["O", "O", "X"]]) should return "O wins".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(tic_tac_toe([["X", "O", "X"], ["X", "O", "X"], ["O", "O", "X"]]), "O wins")`)
}})

tic_tac_toe([["X", "O", "X"], ["O", "X", "O"], ["O", "X", "O"]]) should return "Draw".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(tic_tac_toe([["X", "O", "X"], ["O", "X", "O"], ["O", "X", "O"]]), "Draw")`)
}})

tic_tac_toe([["X", "X", "O"], ["X", "O", "X"], ["O", "X", "X"]]) should return "O wins".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(tic_tac_toe([["X", "X", "O"], ["X", "O", "X"], ["O", "X", "X"]]), "O wins")`)
}})

tic_tac_toe([["X", "O", "O"], ["O", "X", "O"], ["O", "X", "X"]]) should return "X wins".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(tic_tac_toe([["X", "O", "O"], ["O", "X", "O"], ["O", "X", "X"]]), "X wins")`)
}})

tic_tac_toe([["O", "X", "X"], ["X", "O", "O"], ["X", "O", "X"]]) should return "Draw".

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(tic_tac_toe([["O", "X", "X"], ["X", "O", "O"], ["X", "O", "X"]]), "Draw")`)
}})

--seed--

--seed-contents--

def tic_tac_toe(board):

    return board

--solutions--

def tic_tac_toe(board):
    lines = []

    for row in board:
        lines.append(row)

    for c in range(3):
        lines.append([board[0][c], board[1][c], board[2][c]])

    lines.append([board[0][0], board[1][1], board[2][2]])
    lines.append([board[0][2], board[1][1], board[2][0]])

    for line in lines:
        if all(cell == "X" for cell in line):
            return "X wins"
        if all(cell == "O" for cell in line):
            return "O wins"

    return "Draw"