advent_of_code_2025/6/solve_1.go

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main(){
	fmt.Println("Advent of Code 2025 - Day 6 - Part 1")
	f,_:=os.Open("6/input")
	defer f.Close()
	scanner:=bufio.NewScanner(f)
	var grid [][]string
	for scanner.Scan(){
		line:= scanner.Text()
		var operands []string
		for op := range strings.SplitSeq(line," ") {
			if (len(op) > 0){
				operands = append(operands, op)
			}
		}
		grid = append(grid, operands)
	}
	
	operators := grid[len(grid)-1]
	operands_matrix := grid[:len(grid)-1]
	n := len(operands_matrix)
	m := len(operands_matrix[0])
	
	transpose_operands_matrix := make([][]string, m)
	for j:= range m{
		transpose_operands_matrix[j] = make([]string, n)
		for i:= range n{
			transpose_operands_matrix[j][i] = operands_matrix[i][j]
		}
	}

	res := int64(0)
	for i,operation:= range transpose_operands_matrix {
		res += calculate(operators[i], operation)
	}
	fmt.Println(res)
}


func calculate(operator string, operands []string) int64{
	var res int64
	switch(operator){
		case "*":
		res = int64(1)
		for _,op := range operands{
			op_toi,_ := strconv.ParseInt(op,10,64) 
			res *= op_toi
		}
		case "+":
		res = int64(0)
		for _,op := range operands{
			op_toi,_ := strconv.ParseInt(op,10,64) 
			res += op_toi
		}
	}
	return res
}