updated day02 solutions

README.md

@@ -1,4 +1,11 @@
-Repo for all of my advent of code 2019 challenges in GoLang.
-
-https://adventofcode.com/2019
+# Advent of Code 2019
+Language: GoLang.
+[https://adventofcode.com/2019](https://adventofcode.com/2019)
 
+---
+## Summary of Days
+Day | Name | Type of Algo
+--- | --- | ---
+1 | The Tyranny of the Rocket Equation | - Simple math problem
+2 | Program Alarm | - Intro to the crazy Intcode problems that are half the AoC days... <br> - Array (slice...) manipulation <br> - I used recursion
+3 | 

day02/input.txt

@@ -0,0 +1 @@
+1, 12, 2, 3, 1, 1, 2, 3, 1, 3, 4, 3, 1, 5, 0, 3, 2, 1, 6, 19, 1, 19, 5, 23, 2, 13, 23, 27, 1, 10, 27, 31, 2, 6, 31, 35, 1, 9, 35, 39, 2, 10, 39, 43, 1, 43, 9, 47, 1, 47, 9, 51, 2, 10, 51, 55, 1, 55, 9, 59, 1, 59, 5, 63, 1, 63, 6, 67, 2, 6, 67, 71, 2, 10, 71, 75, 1, 75, 5, 79, 1, 9, 79, 83, 2, 83, 10, 87, 1, 87, 6, 91, 1, 13, 91, 95, 2, 10, 95, 99, 1, 99, 6, 103, 2, 13, 103, 107, 1, 107, 2, 111, 1, 111, 9, 0, 99, 2, 14, 0, 0

day02/main.go

@@ -1,67 +0,0 @@
-package main
-
-import "fmt"
-
-func calcValue(input []int, target int, noun int, verb int) bool {
-	// update the 1 and 2 values here
-	input[1] = noun
-	input[2] = verb
-
-	// fmt.Println(input)
-
-	// loop through all "instructions"
-	for i := 0; i < len(input); i += 4 {
-		// check opertor type (1 2 or 99)
-		operator := input[i]
-		// if it's not 99 (don't terminate, and run a calculation)
-		if operator != 99 {
-			// grab the two values to be added or multiplied
-			value1 := input[input[i+1]]
-			value2 := input[input[i+2]]
-
-			// grab the index that will get the new value
-			indexToUpdate := input[i+3]
-
-			// perform calcuation based on operator value
-			if operator == 1 {
-				input[indexToUpdate] = value1 + value2
-			} else if operator == 2 {
-				input[indexToUpdate] = value1 * value2
-			}
-		} else {
-			// if it is 99, break out of this loop
-			break
-		}
-	}
-
-	// if the target value is found, return true
-	if input[0] == target {
-		return true
-	}
-	return false
-}
-
-func main() {
-	// defualt input slice, index 1 and 2 will be replaced
-	input := []int{1, 12, 2, 3, 1, 1, 2, 3, 1, 3, 4, 3, 1, 5, 0, 3, 2, 1, 6, 19, 1, 19, 5, 23, 2, 13, 23, 27, 1, 10, 27, 31, 2, 6, 31, 35, 1, 9, 35, 39, 2, 10, 39, 43, 1, 43, 9, 47, 1, 47, 9, 51, 2, 10, 51, 55, 1, 55, 9, 59, 1, 59, 5, 63, 1, 63, 6, 67, 2, 6, 67, 71, 2, 10, 71, 75, 1, 75, 5, 79, 1, 9, 79, 83, 2, 83, 10, 87, 1, 87, 6, 91, 1, 13, 91, 95, 2, 10, 95, 99, 1, 99, 6, 103, 2, 13, 103, 107, 1, 107, 2, 111, 1, 111, 9, 0, 99, 2, 14, 0, 0}
-
-	// brute force to try all options for nouns and verbs
-outer:
-	for i := 0; i < 100; i++ {
-		for j := 0; j < 100; j++ {
-			// crete a copy of the input slice
-			clone := make([]int, 120)
-			copy(clone, input)
-
-			// if the calcValue function returns true, break out of the loops and print the values to the console
-			if calcValue(clone, 19690720, i, j) == true {
-				// print answers to console (manually add to advent of code)
-				fmt.Println("noun is", i, "verb is", j)
-				fmt.Println("actual result value noun * 10 + verb = ", i*100+j)
-
-				// use labeled outer loop to break out of both for loops
-				break outer
-			}
-		}
-	}
-}

day02/part1/main.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"adventofcode/util"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	// read the input file and place into slice of strings
+	inputFile := util.ReadFile("../input.txt")
+	splitStrings := strings.Split(inputFile, ", ")
+
+	// convert to slice of numbers
+	inputNumbers := make([]int, len(splitStrings))
+	for i, v := range splitStrings {
+		inputNumbers[i], _ = strconv.Atoi(v)
+	}
+
+	// start running the step function
+	step(inputNumbers, 0)
+	fmt.Println("Final value at address 0 is:", inputNumbers[0])
+}
+
+// step will read the next 4 values in the input `sli` and make updates according to the opcodes
+func step(sli []int, index int) bool {
+	if sli[index] == 99 {
+		return false
+	}
+	opcode, two, three, four := read(sli, index)
+	switch opcode {
+	case 1:
+		sli[four] = sli[two] + sli[three]
+	case 2:
+		sli[four] = sli[two] * sli[three]
+	}
+	// recursively call itself & increment index value...
+	return step(sli, index+4)
+}
+
+// this read function may be necessary later as the intcode thingy becomes more complex
+func read(sli []int, index int) (int, int, int, int) {
+	return sli[index], sli[index+1], sli[index+2], sli[index+3]
+}

day02/part2/main.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"adventofcode/util"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	// read the input file, modify it to a slice of numbers
+	inputFile := util.ReadFile("../input.txt")
+	splitStrings := strings.Split(inputFile, ", ")
+	inputNumbers := make([]int, len(splitStrings))
+
+	for i, v := range splitStrings {
+		inputNumbers[i], _ = strconv.Atoi(v)
+	}
+
+	// brute force to try all options for nouns and verbs
+	for i := 0; i < 100; i++ {
+		for j := 0; j < 100; j++ {
+			// crete a copy of the inputNumbers slice
+			clone := make([]int, 120)
+			copy(clone, inputNumbers)
+			clone[1] = i
+			clone[2] = j
+
+			// run step on the cloned slice
+			step(clone, 0)
+			// check if the zero address is equal to the AoC value
+			if clone[0] == 19690720 {
+				// print answers to console (manually add to advent of code)
+				fmt.Println("noun is", i, "verb is", j)
+				fmt.Println("actual result value noun * 10 + verb = ", i*100+j)
+
+				// return to end main function
+				return
+			}
+		}
+	}
+}
+
+// step will read the next 4 values in the input `sli` and make updates
+// according to the opcodes
+func step(sli []int, index int) bool {
+	if sli[index] == 99 {
+		return false
+	}
+	opcode, two, three, four := read(sli, index)
+	switch opcode {
+	case 1:
+		sli[four] = sli[two] + sli[three]
+	case 2:
+		sli[four] = sli[two] * sli[three]
+	}
+	// recursively call itself & increment index value...
+	return step(sli, index+4)
+}
+
+func read(sli []int, index int) (int, int, int, int) {
+	return sli[index], sli[index+1], sli[index+2], sli[index+3]
+}