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Solution.cpp
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122 lines (104 loc) · 2.86 KB
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//
// Created by cfwloader on 3/9/16.
//
#include <iostream>
#include "Solution.h"
bool Solution::isValidSudoku(vector<vector<char>> &board)
{
// Validate the matrix.
if(board.size() != 9)
{
return false;
}
for (vector<vector<char>>::iterator iterator = board.begin(); iterator != board.end(); ++iterator)
{
if(iterator->size() != 9)
{
return false;
}
}
bool presented[10];
// Check Columns.
for(int row = 0; row < board.size(); ++row)
{
for (int i = 0; i < 10; ++i)
{
presented[i] = false;
}
for (int col = 0; col < board[row].size(); ++col)
{
if(board[row][col] == '.')
{
continue;
}
if(presented[board[row][col] - '0'])
{
return false;
}
else
{
presented[board[row][col] - '0'] = true;
}
}
}
// Check rows.
for(int row = 0; row < board.size(); ++row)
{
for (int i = 0; i < 10; ++i)
{
presented[i] = false;
}
for (int col = 0; col < board[row].size(); ++col)
{
if(board[col][row] == '.')
{
continue;
}
if(presented[board[col][row] - '0'])
{
return false;
}
else
{
presented[board[col][row] - '0'] = true;
}
}
}
// Check blocks.
for (int blockRow = 1; blockRow < 4; ++blockRow)
{
for (int blockCol = 1; blockCol < 4 ; ++blockCol)
{
for (int i = 0; i < 10; ++i)
{
presented[i] = false;
}
// std::cout << "Block bound:" << (blockRow - 1) * 3 << "-" << blockRow * 3 - 1 << ", " << (blockCol - 1) * 3 << "-" << blockCol * 3 - 1<< std::endl;
for (int row = (blockRow - 1) * 3; row <= blockRow * 3 - 1; ++row)
{
for (int col = (blockCol - 1) * 3; col <= blockCol * 3 - 1; ++col)
{
if(board[row][col] == '.')
{
continue;
}
/*
if(row >= 0 && row < 3 && col > 2 && col < 6)
{
printf("(%d,%d)->%c, present:%d\n", row, col, board[row][col], presented[board[row][col] - '0']);
}
*/
if(presented[board[row][col] - '0'])
{
return false;
}
else
{
presented[board[row][col] - '0'] = true;
}
}
}
}
}
return true;
}