2025 Day 6 Complete!

2025/day06/main.go

@@ -0,0 +1,125 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	part1(inp)
+	fmt.Println()
+	part2(inp)
+}
+
+func part1(inp []string) {
+	var ret int
+	nums := pt1ParseNums(inp[:len(inp)-1])
+	var results []int
+	ops := strings.Fields(inp[len(inp)-1])
+	results = pt1ApplyOps(ops, nums)
+	for i := range results {
+		ret = ret + results[i]
+	}
+	fmt.Println("# Part 1")
+	fmt.Println(ret)
+}
+
+func part2(inp []string) {
+	var ret int
+	nums := pt2ParseNums(inp[:len(inp)-1])
+	var results []int
+	ops := strings.Fields(inp[len(inp)-1])
+	results = pt2ApplyOps(ops, nums)
+	for i := range results {
+		ret = ret + results[i]
+	}
+	fmt.Println("# Part 2")
+	fmt.Println(ret)
+}
+
+func pt1ParseNums(inp []string) [][]int {
+	var nums [][]int
+	for i := range inp {
+		l := strings.Fields(inp[i])
+		// Row of numbers
+		var n []int
+		for j := range l {
+			n = append(n, h.Atoi(l[j]))
+		}
+		nums = append(nums, n)
+	}
+	return nums
+}
+
+func pt2ParseNums(inp []string) [][]int {
+	var nums [][]int
+	var cols [][]byte
+	for _, row := range inp {
+		for j := range row {
+			if len(cols) <= j {
+				cols = append(cols, []byte{})
+			}
+			cols[j] = append(cols[j], row[j])
+		}
+	}
+	var nCol []int
+	for i := range cols {
+		stC := string(cols[i])
+		if strings.TrimSpace(stC) == "" {
+			if len(nCol) > 0 {
+				nums = append(nums, nCol)
+				nCol = []int{}
+			}
+			continue
+		}
+
+		nCol = append(nCol, h.Atoi(stC))
+	}
+	if len(nCol) > 0 {
+		nums = append(nums, nCol)
+	}
+	return nums
+}
+
+func pt1ApplyOps(ops []string, nums [][]int) []int {
+	var res []int
+	for i := range ops {
+		var colRes int
+		switch ops[i][0] {
+		case '+':
+			for j := range nums {
+				colRes += nums[j][i]
+			}
+		case '*':
+			colRes = 1
+			for j := range nums {
+				colRes *= nums[j][i]
+			}
+		}
+		res = append(res, colRes)
+	}
+	return res
+}
+
+func pt2ApplyOps(ops []string, nums [][]int) []int {
+	var res []int
+	for i := range nums {
+		var colRes int
+		switch ops[i][0] {
+		case '+':
+			for j := range nums[i] {
+				colRes += nums[i][j]
+			}
+		case '*':
+			colRes = 1
+			for j := range nums[i] {
+				colRes *= nums[i][j]
+			}
+		}
+		res = append(res, colRes)
+	}
+	return res
+}