From e275c8c30af198c17a84d0ac288154df51282b77 Mon Sep 17 00:00:00 2001
From: lonkaars <loek@pipeframe.xyz>
Date: Sun, 3 Dec 2023 16:47:51 +0100
Subject: garbage man day 3 complete

---
 03/main.cc | 117 +++++++++++++++++++++++++++++--------------------------------
 1 file changed, 55 insertions(+), 62 deletions(-)

diff --git a/03/main.cc b/03/main.cc
index b452c95..64e6748 100644
--- a/03/main.cc
+++ b/03/main.cc
@@ -1,86 +1,79 @@
 #include <bits/stdc++.h>
+#include <vector>
 using namespace std;
 
-const vector<char> SYMBOLS = {'#', '$', '%', '&', '*', '+', '-', '/', '=', '@'};
+const vector<char> SYMBOLS = {'#', '$', '%', '&', '+', '-', '/', '=', '@', '*'};
 const vector<char> NUMBERS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
 
 int main() {
-	// phase 1 -- read lines into buffer
 	vector<string> lines;
 	for (string line; getline(cin, line);)
 		lines.push_back(line);
 	size_t rows = lines.size();
 	size_t cols = lines[0].size();
 
-	// phase 2 -- create valid number mask
-	vector<vector<bool>> valid_mask(rows, vector<bool>(cols, false));
-	for (int i = 0; i < rows; i++) {
-		for (int j = 0; j < cols; j++) {
-			// row and column offset for checking diagonals too
-			for (int roff = -1; roff <= 1; roff++) {
-				for (int coff = -1; coff <= 1; coff++) {
-					// skip any x,y coordinates that are outide the "grid"
-					int y = i + roff;
-					if (y < 0) continue;
-					if (y >= rows) continue;
-					int x = j + coff;
-					if (x < 0) continue;
-					if (x >= cols) continue;
+	int output = 0;
 
-					for (char symbol : SYMBOLS)
-						if (lines[y][x] == symbol)
-							valid_mask[i][j] = true;
-				}
-			}
+	auto check_and_mark = [lines, cols](vector<vector<bool>> &checked, unsigned int row, unsigned int col) -> int {
+		int number = 0;
+		if (lines[row][col] < '0' || lines[row][col] > '9') return number;
+		int begin_col = col;
+		while (true) {
+			if ((begin_col - 1) < 0) break;
+			if (lines[row][begin_col - 1] >= '0' && lines[row][begin_col - 1] <= '9')
+				begin_col--;
+			else
+				break;
 		}
-	}
 
-	for (int i = 0; i < rows; i++) {
-		for (int j = 0; j < cols; j++)
-			printf("%c", lines[i][j]);
-		printf("\n");
-	}
-	for (int i = 0; i < rows; i++) {
-		for (int j = 0; j < cols; j++)
-			printf("%c", valid_mask[i][j] ? 'x' : ' ');
-		printf("\n");
-	}
+		for (col = begin_col; lines[row][col] >= '0' && lines[row][col] <= '9' && col < cols; col++) {
+			number *= 10;
+			number += lines[row][col] - '0';
+			checked[row][col] = true;
+		}
+
+		printf("%d at beginning coords %c%d\n", number, "ABCDEFGHIJKLMNOP"[begin_col], row +1);
+
+		return number;
+	};
 
-	// phase 3 -- read each number and add to output if any of its digits are
-	//            true in valid_mask
-	int output = 0;
-	int digit = 0;
-	int valid_digit = false;
 	for (int i = 0; i < rows; i++) {
 		for (int j = 0; j < cols; j++) {
-			char cell = lines[i][j];
-			bool valid = valid_mask[i][j];
-			int last_digit = digit;
-			for (char num : NUMBERS) {
-				if (cell != num)
-					continue;
 
-				// printf("[%c]", cell);
-				digit *= 10;
-				digit += cell - '0';
-				if (valid)
-					valid_digit = true;
-			}
-			if (digit == last_digit && digit != 0) {
-				// printf(" (inline, %d, %s)\n", digit, valid_digit ? "valid" : "not valid");
-				if (valid_digit)
-					output += digit;
-				digit = 0;
-				valid_digit = false;
+			for (char symbol : SYMBOLS) {
+
+				if (lines[i][j] == symbol) {
+					int temp_cogs_mul = 1;
+					unsigned int temp_cogs_cnt = 0;
+					vector<vector<bool>> checked(rows, vector<bool>(cols, false));
+					printf("[%c at %c%d]\n", lines[i][j], "ABCDEFGHIJKLMNOP"[j], i +1);
+					for (int roff = -1; roff <= 1; roff++) {
+						for (int coff = -1; coff <= 1; coff++) {
+
+							// skip any x,y coordinates that are outide the "grid"
+							int y = i + roff;
+							if (y < 0) continue;
+							if (y >= rows) continue;
+							int x = j + coff;
+							if (x < 0) continue;
+							if (x >= cols) continue;
+
+							if (checked[y][x] == true) continue;
+
+							int number = check_and_mark(checked, y, x);
+							if (number > 0 && lines[i][j] == '*') {
+								temp_cogs_mul *= number;
+								temp_cogs_cnt++;
+							}
+						}
+					}
+					if (temp_cogs_cnt == 2) {
+						printf("cog count 2, adding ratio %d\n", temp_cogs_mul);
+						output += temp_cogs_mul;
+					}
+				}
 			}
 		}
-		if (digit != 0) {
-			// printf(" (EOL, %d, %s)\n", digit, valid_digit ? "valid" : "not valid");
-			if (valid_digit)
-				output += digit;
-			digit = 0;
-			valid_digit = false;
-		}
 	}
 
 	printf(">> %d\n", output);
-- 
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