From 31effe9cb4c000d891667ea389368e34fd69ba94 Mon Sep 17 00:00:00 2001 From: James Griffin Date: Fri, 18 Dec 2020 21:13:07 -0400 Subject: [PATCH] Day 18: Part 1 and 2 Signed-off-by: James Griffin --- eighteen/day_eighteen.go | 181 +++++++++++++++++ eighteen/day_eighteen_test.go | 153 ++++++++++++++ eighteen/input.txt | 372 ++++++++++++++++++++++++++++++++++ eighteen/sample.txt | 6 + eighteen/sample1.txt | 1 + eighteen/sample2.txt | 1 + eighteen/sample4.txt | 1 + eighteen/sample6.txt | 1 + main.go | 9 +- 9 files changed, 723 insertions(+), 2 deletions(-) create mode 100644 eighteen/day_eighteen.go create mode 100644 eighteen/day_eighteen_test.go create mode 100644 eighteen/input.txt create mode 100644 eighteen/sample.txt create mode 100644 eighteen/sample1.txt create mode 100644 eighteen/sample2.txt create mode 100644 eighteen/sample4.txt create mode 100644 eighteen/sample6.txt diff --git a/eighteen/day_eighteen.go b/eighteen/day_eighteen.go new file mode 100644 index 0000000..3e64b1f --- /dev/null +++ b/eighteen/day_eighteen.go @@ -0,0 +1,181 @@ +package eighteen + +import ( + "bufio" + "fmt" + "os" + "strconv" +) + +type worksheet struct { + problems []problem +} + +type problem struct { + lhs int + lhsP *problem + operator string + rhs *problem +} + +func parse(input string) *problem { + p := problem{} + value := "" + operation := false + + for i := 0; i < len(input); i++ { + switch string(input[i]) { + case " ": + v, _ := strconv.Atoi(value) + p.lhs = v + case "*", "+": + p.operator = string(input[i]) + operation = true + case "(": + p.lhsP = parse(input[i+1:]) + chars := 0 + b := 1 + for j := i + 1; j < len(input); j++ { + chars++ + if string(input[j]) == "(" { + b++ + } else if string(input[j]) == ")" { + b-- + } + if b == 0 { + break + } + } + i += chars + case ")": + v, _ := strconv.Atoi(value) + p.lhs = v + return &p + default: + value += string(input[i]) + } + + if operation { + p.rhs = parse(input[i+2:]) + return &p + } + } + v, _ := strconv.Atoi(value) + p.lhs = v + + return &p +} + +func (p *problem) eval() int { + result := p.lhs + if p.lhsP != nil { + result = p.lhsP.eval() + } + + op := p.operator + next := p.rhs + for next != nil { + v := next.lhs + if next.lhsP != nil { + v = next.lhsP.eval() + } + switch op { + case "+": + result += v + case "*": + result *= v + } + + op = next.operator + next = next.rhs + } + + return result +} + +func (p *problem) advEval() int { + sums := []int{} + result := p.lhs + if p.lhsP != nil { + result = p.lhsP.advEval() + } + + op := p.operator + next := p.rhs + for next != nil { + v := next.lhs + if next.lhsP != nil { + v = next.lhsP.advEval() + } + switch op { + case "+": + result += v + case "*": + sums = append(sums, result) + result = v + } + + if next.rhs == nil { + sums = append(sums, result) + } + + op = next.operator + next = next.rhs + } + + product := 1 + for _, sum := range sums { + product *= sum + } + + return product +} + +func (w *worksheet) load(filename string) error { + file, err := os.Open(filename) + if err != nil { + return err + } + defer file.Close() + + scanner := bufio.NewScanner(file) + for scanner.Scan() { + w.problems = append(w.problems, *parse(scanner.Text())) + } + + return nil +} + +func (w *worksheet) sum() int { + sum := 0 + for _, p := range w.problems { + sum += p.eval() + } + + return sum +} + +func (w *worksheet) advSum() int { + sum := 0 + for _, p := range w.problems { + sum += p.advEval() + } + + return sum +} + +// PartOne What is the sum of the homework +func PartOne() string { + w := worksheet{} + w.load("eighteen/input.txt") + + return fmt.Sprintf("The sum of the homework is %d", w.sum()) +} + +// PartTwo What is the advanced sum of the homework +func PartTwo() string { + w := worksheet{} + w.load("eighteen/input.txt") + + return fmt.Sprintf("The advanced sum of the homework is %d", w.advSum()) +} diff --git a/eighteen/day_eighteen_test.go b/eighteen/day_eighteen_test.go new file mode 100644 index 0000000..8f2d8b2 --- /dev/null +++ b/eighteen/day_eighteen_test.go @@ -0,0 +1,153 @@ +package eighteen + +import "testing" + +func Test_math_parse(t *testing.T) { + w := worksheet{} + w.load("sample.txt") + + if len(w.problems) != 6 { + t.Logf("Expected 6 probems, found %d", len(w.problems)) + t.FailNow() + } +} + +func Test_problem_eval1(t *testing.T) { + w := worksheet{} + w.load("sample1.txt") + + result := w.problems[0].eval() + if result != 71 { + t.Logf("Expected result of 71, got %d", result) + t.Fail() + } +} + +func Test_problem_eval2(t *testing.T) { + w := worksheet{} + w.load("sample2.txt") + + result := w.problems[0].eval() + if result != 51 { + t.Logf("Expected result of 51, got %d", result) + t.Fail() + } +} + +func Test_problem_eval4(t *testing.T) { + w := worksheet{} + w.load("sample4.txt") + + result := w.problems[0].eval() + if result != 437 { + t.Logf("Expected result of 437, got %d", result) + t.Fail() + } +} + +func Test_problem_eval6(t *testing.T) { + w := worksheet{} + w.load("sample6.txt") + + result := w.problems[0].eval() + if result != 13632 { + t.Logf("Expected result of 13632, got %d", result) + t.Fail() + } +} + +func Test_problem_eval(t *testing.T) { + w := worksheet{} + w.load("sample.txt") + + result := w.problems[0].eval() + if result != 71 { + t.Logf("Expected result of 71, got %d", result) + t.Fail() + } + + result = w.problems[1].eval() + if result != 51 { + t.Logf("Expected result of 51, got %d", result) + t.Fail() + } + + result = w.problems[2].eval() + if result != 26 { + t.Logf("Expected result of 26, got %d", result) + t.Fail() + } + + result = w.problems[3].eval() + if result != 437 { + t.Logf("Expected result of 437, got %d", result) + t.Fail() + } + + result = w.problems[4].eval() + if result != 12240 { + t.Logf("Expected result of 12240, got %d", result) + t.Fail() + } + + result = w.problems[5].eval() + if result != 13632 { + t.Logf("Expected result of 13632, got %d", result) + t.Fail() + } +} + +func Test_sheet_eval(t *testing.T) { + w := worksheet{} + w.load("sample.txt") + + result := w.sum() + if result != 26457 { + t.Logf("Expected result of 26457, got %d", result) + t.FailNow() + } +} + +func Test_problem_advEval1(t *testing.T) { + w := worksheet{} + w.load("sample1.txt") + + result := w.problems[0].advEval() + if result != 231 { + t.Logf("Expected result of 231, got %d", result) + t.Fail() + } +} + +func Test_problem_advEval2(t *testing.T) { + w := worksheet{} + w.load("sample2.txt") + + result := w.problems[0].advEval() + if result != 51 { + t.Logf("Expected result of 51, got %d", result) + t.Fail() + } +} + +func Test_problem_advEval6(t *testing.T) { + w := worksheet{} + w.load("sample6.txt") + + result := w.problems[0].advEval() + if result != 23340 { + t.Logf("Expected result of 23340, got %d", result) + t.Fail() + } +} + +func Test_sheet_advEval(t *testing.T) { + w := worksheet{} + w.load("sample.txt") + + result := w.advSum() + if result != 694173 { + t.Logf("Expected result of 694173, got %d", result) + t.FailNow() + } 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new file mode 100644 index 0000000..e239b79 --- /dev/null +++ b/eighteen/sample4.txt @@ -0,0 +1 @@ +5 + (8 * 3 + 9 + 3 * 4 * 3) \ No newline at end of file diff --git a/eighteen/sample6.txt b/eighteen/sample6.txt new file mode 100644 index 0000000..717b596 --- /dev/null +++ b/eighteen/sample6.txt @@ -0,0 +1 @@ +((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2 \ No newline at end of file diff --git a/main.go b/main.go index 9582aa1..734a7ff 100644 --- a/main.go +++ b/main.go @@ -3,7 +3,7 @@ package main import ( "fmt" - "github.com/thatguygriff/aoc2020/seventeen" + "github.com/thatguygriff/aoc2020/eighteen" ) func main() { @@ -72,5 +72,10 @@ func main() { // fmt.Println(sixteen.PartTwo()) // Day 17 - fmt.Println(seventeen.PartTwo()) + // fmt.Println(seventeen.PartOne()) + // fmt.Println(seventeen.PartTwo()) + + // Day 18 + fmt.Println(eighteen.PartOne()) + fmt.Println(eighteen.PartTwo()) }