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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
199093 changed files with 3378972 additions and 0 deletions
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67
Task/Sudoku/C/sudoku.c Normal file
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#include <stdio.h>
void show(int *x)
{
int i, j;
for (i = 0; i < 9; i++) {
if (!(i % 3)) putchar('\n');
for (j = 0; j < 9; j++)
printf(j % 3 ? "%2d" : "%3d", *x++);
putchar('\n');
}
}
int trycell(int *x, int pos)
{
int row = pos / 9;
int col = pos % 9;
int i, j, used = 0;
if (pos == 81) return 1;
if (x[pos]) return trycell(x, pos + 1);
for (i = 0; i < 9; i++)
used |= 1 << (x[i * 9 + col] - 1);
for (j = 0; j < 9; j++)
used |= 1 << (x[row * 9 + j] - 1);
row = row / 3 * 3;
col = col / 3 * 3;
for (i = row; i < row + 3; i++)
for (j = col; j < col + 3; j++)
used |= 1 << (x[i * 9 + j] - 1);
for (x[pos] = 1; x[pos] <= 9; x[pos]++, used >>= 1)
if (!(used & 1) && trycell(x, pos + 1)) return 1;
x[pos] = 0;
return 0;
}
void solve(const char *s)
{
int i, x[81];
for (i = 0; i < 81; i++)
x[i] = s[i] >= '1' && s[i] <= '9' ? s[i] - '0' : 0;
if (trycell(x, 0))
show(x);
else
puts("no solution");
}
int main(void)
{
solve( "5x..7...."
"6..195..."
".98....6."
"8...6...3"
"4..8.3..1"
"7...2...6"
".6....28."
"...419..5"
"....8..79" );
return 0;
}