From 6bc7fdab077b1877f71b69f4b2c1e8046a302e9b Mon Sep 17 00:00:00 2001
From: David Phillips <dbphillipsnz@gmail.com>
Date: Wed, 9 Mar 2016 00:21:35 +1300
Subject: Initial working copy, buggy

---
 .gitignore |   2 +
 Makefile   |   8 +++
 cell.h     |   7 +++
 display.c  |  26 +++++++++
 display.h  |   1 +
 solve.c    | 174 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 218 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 cell.h
 create mode 100644 display.c
 create mode 100644 display.h
 create mode 100644 solve.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b22666a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.o
+solve
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..09fc878
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,8 @@
+CFLAGS += -Werror -Wall
+
+all: solve
+
+solve: display.o
+
+clean:
+	rm -f *.o solve 
diff --git a/cell.h b/cell.h
new file mode 100644
index 0000000..76ecd90
--- /dev/null
+++ b/cell.h
@@ -0,0 +1,7 @@
+struct cell
+{
+	char val;
+	char not[9];
+} cell;
+
+
diff --git a/display.c b/display.c
new file mode 100644
index 0000000..f147570
--- /dev/null
+++ b/display.c
@@ -0,0 +1,26 @@
+#include "cell.h"
+
+#include <stdio.h>
+
+void display(struct cell board[9][9])
+{
+	int x;
+	int y;
+	int val;
+	for (y = 0; y < 9; y++)
+	{
+		if (y % 3 == 0 && y != 0)
+			printf("------+------+------\n");
+		for (x = 0; x < 9; x++)
+		{
+			if (x % 3 == 0 && x != 0)
+				printf("|");
+
+			val = board[x][y].val;
+
+			printf("%c ", val == 0? ' ' : val+'0');
+		}
+		printf("\n");
+	}
+	printf("\n");
+}
diff --git a/display.h b/display.h
new file mode 100644
index 0000000..b3b5a3d
--- /dev/null
+++ b/display.h
@@ -0,0 +1 @@
+void display(struct cell board[9][9]);
diff --git a/solve.c b/solve.c
new file mode 100644
index 0000000..f8947c9
--- /dev/null
+++ b/solve.c
@@ -0,0 +1,174 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "cell.h"
+#include "display.h"
+
+void update_not_row_col(struct cell b[9][9])
+{
+	int x = 0;
+	int y = 0;
+	int i = 0;
+	int val = 0;
+
+	for (y = 0; y < 9; y++)
+	{
+		for (x = 0; x < 9; x++)
+		{
+			val = b[x][y].val;
+			if (val != 0)
+			{
+				for (i = 0; i < 9; i++)
+				{
+					b[i][y].not[val - 1] = 1;
+					b[x][i].not[val - 1] = 1;
+				}
+			}
+		}
+	}
+}
+
+void not_to_val_row_col(struct cell b[9][9])
+{
+	int x = 0;
+	int y = 0;
+	int i = 0;
+	int val = 0;
+	int total = 0;
+
+	for (y = 0; y < 9; y++)
+	{
+		total = 0;
+		for (x = 0; x < 9; x++)
+		{
+			if (b[x][y].val != 0)
+				continue;
+
+			for (i = 0; i < 9; i++)
+			{
+				if (b[x][y].not[i])
+				{
+					total++;
+				} else {
+					val = i + 1;
+				}
+			}
+			if (total == 8)
+				b[x][y].val = val;
+		}
+	}
+}
+
+
+void not_to_val_cell(struct cell b[9][9])
+{
+	int cx = 0;
+	int cy = 0;
+	int x = 0;
+	int y = 0;
+	int n = 0;
+	int potentials = 0;
+	int okx, oky;
+	struct cell c;
+
+	/* refactor this crap */
+	for (cy = 0; cy < 9; cy += 3)
+	{
+		for (cx = 0; cx < 9; cx += 3)
+		{
+			/* for each val that has to be in cell */
+			for (n = 1; n <= 9; n++)
+			{
+				for (y = 0; y < 3; y++)
+				{
+					for (x = 0; x < 3; x++)
+					{
+						c = b[cx+x][cy+y];
+						if (c.val == n)
+						{
+							potentials = 0;
+							y = 3;
+							break;
+						}
+						if (c.val)
+							continue;
+
+						if (c.not[n-1] == 0)
+						{
+							potentials++;
+							okx = x;
+							oky = y;
+						}
+					}
+				}
+				if (potentials == 1)
+				{
+					b[cx+okx][cy+oky].val = n;
+					potentials = 0;
+				}
+			}
+		}
+	}
+}
+
+int main(int argc, char **argv)
+{
+//	int x = 0;
+//	int y = 0;
+	struct cell board[9][9];
+
+	memset(board, 0, sizeof(board));
+
+
+	board[7][0].val = 3;
+	board[4][1].val = 3;
+	board[0][7].val = 3;
+	board[1][4].val = 3;
+
+	/* dummy board taken from the guardian lol */
+	/* FIXME: have  a way to input boards, silly */
+	board[0][0].val = 7;
+	board[0][4].val = 5;
+
+	board[1][2].val = 5;
+	board[1][4].val = 9;
+
+	board[2][1].val = 6;
+	board[2][2].val = 4;
+	board[2][5].val = 2;
+
+	board[3][0].val = 1;
+	board[3][5].val = 9;
+	board[3][6].val = 7;
+
+	board[4][0].val = 9;
+	board[4][2].val = 6;
+	board[4][3].val = 4;
+	board[4][7].val = 8;
+	board[4][8].val = 5;
+
+	board[5][4].val = 2;
+
+	board[6][4].val = 8;
+	board[6][6].val = 5;
+	board[6][7].val = 6;
+
+	board[7][1].val = 8;
+	board[7][6].val = 3;
+
+	board[8][0].val = 4;
+	board[8][4].val = 1;
+	board[8][5].val = 7;
+	board[8][8].val = 8;
+
+
+
+	display(board);
+
+	update_not_row_col(board);
+	not_to_val_cell(board);
+	not_to_val_row_col(board);
+
+	display(board);
+
+}
-- 
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