diff --git a/2020/day17/main.go b/2020/day17/main.go index 7ff3d89..dbe6b62 100644 --- a/2020/day17/main.go +++ b/2020/day17/main.go @@ -10,8 +10,6 @@ func main() { fmt.Println("# Day 17") fmt.Println() inp := h.StdinToStringSlice() - //field := h.StringSliceToCoord3dByteMap(inp) - //part1old(field) fmt.Println("## Part 1:\nAnswer:", run(inp, 3)) fmt.Println("## Part 2:\nAnswer:", run(inp, 4)) } diff --git a/2020/day18/input b/2020/day18/input new file mode 100644 index 0000000..19a0c6f --- /dev/null +++ b/2020/day18/input @@ -0,0 +1,374 @@ +2 + ((6 * 6 + 4 + 3 * 4) + (4 + 3 + 5) * 3 * (5 * 6 + 5 * 3 + 6)) * 2 + 3 * (6 * (4 + 4 * 4) * 2 * 3 * 8) +6 * 3 + 5 * ((9 * 9 + 3) + (2 + 5 * 6 + 4)) + 7 + 9 +7 * 3 + 8 + 8 * 4 * (4 * (7 * 4) + 9 * 5) +3 * 4 + 8 + 5 +8 + (8 + (3 + 6) * 9 + 9 * 5) * ((5 + 9 * 7 * 3) * 4 * 5) + 6 + 9 +((2 * 9 + 4 + 5) * 5) + 2 +(4 * 8 * 5 * 7) * 2 * ((3 + 9 + 8) * 9 * 8) +(8 + 4 * 8) + (4 + 8 * 8) + 5 + 6 +8 * (9 * 6 * 2 + (8 + 8 * 3 + 8 + 8) * 7 * (8 * 9 + 8 * 5 * 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3 + 9 * 6 * 8 +((8 + 5 * 2) + 4 + 8) + (2 * 5) +(6 + 6 * 8) + 4 * 3 + (8 * 2 + 2 * 3) * (7 * (8 * 4)) * 9 +6 * (9 * 5 + 5 * 3) + 8 + ((8 + 3) * (3 + 5 * 7 + 9 * 9 + 2)) + 6 + 2 +(7 * 7) * ((3 * 7) + 9 + 4) + (4 * 9 * 8 * 6 * (2 + 4 * 4)) + 5 +4 * 3 + 6 * 8 * 5 * (4 * 7 + (5 + 5 + 5 + 3 + 5)) +(2 + 6 + (6 * 5 + 4 * 8) * 3 + 2) + 6 + 3 +(4 * 5 * 7 * 6 + 6 + (2 * 8 * 6 + 2 + 9)) + 4 + 7 +9 * 4 * 5 + 2 diff --git a/2020/day18/main.go b/2020/day18/main.go new file mode 100644 index 0000000..e8278ab --- /dev/null +++ b/2020/day18/main.go @@ -0,0 +1,129 @@ +package main + +import ( + "fmt" + "regexp" + "strings" + + h "git.bullercodeworks.com/brian/adventofcode/helpers" +) + +var rgx = regexp.MustCompile(`\([0-9\*\+ ]*\)`) + +const ( + LtoR = iota + AthenM +) + +func main() { + fmt.Println("# Day 17") + fmt.Println() + inp := h.StdinToStringSlice() + fmt.Println("## Part1\nAnswer:", sum(inp, LtoR)) + fmt.Println("## Part2\nAnswer:", sum(inp, AthenM)) +} + +func sum(inp []string, algo int) int { + var ret int + for k := range inp { + ret = ret + solve(inp[k], algo) + } + return ret +} + +func solve(inp string, algo int) int { + var total int + rs := rgx.FindString(inp) + if rs == "" { + // no parentheticals + total = evaluateLine(inp, algo) + } else { + for rs != "" { + repl := evaluateLine(rs[1:len(rs)-1], algo) + inp = strings.Replace(inp, rs, h.Itoa(repl), -1) + rs = rgx.FindString(inp) + } + total = evaluateLine(inp, algo) + } + return total +} + +func evaluateLine(inp string, algo int) int { + switch algo { + case LtoR: + return evaluateLineLtoR(inp) + case AthenM: + return evaluateLineAthenM(inp) + } + return 0 +} + +func evaluateLineLtoR(inp string) int { + var cnt, total int + var op string + // No parentheticals + pts := strings.Split(inp, " ") + for k := range pts { + switch pts[k] { + case "*", "+": + op = pts[k] + default: + if cnt == 0 { + total = h.Atoi(pts[k]) + cnt++ + } else { + if op == "+" { + total = total + h.Atoi(pts[k]) + } else { + total = total * h.Atoi(pts[k]) + } + } + } + } + return total +} + +func evaluateLineAthenM(inp string) int { + // First solve all addition + inp = evaluateLineAddition(inp) + inp = evaluateLineMultiplication(inp) + return h.Atoi(inp) +} + +func evaluateLineAddition(inp string) string { + var newPts []string + for strings.Contains(inp, "+") { + pts := strings.Split(inp, " ") + for k := 0; k < len(pts); k++ { + if pts[k] == "+" { + newPts = pts[:k-1] + newPts = append(newPts, h.Itoa(h.Atoi(pts[k-1])+h.Atoi(pts[k+1]))) + newPts = append(newPts, pts[k+2:]...) + inp = strings.Join(newPts, " ") + break + } + } + } + return inp +} + +func evaluateLineMultiplication(inp string) string { + var newPts []string + for strings.Contains(inp, "*") { + pts := strings.Split(inp, " ") + for k := 0; k < len(pts); k++ { + if pts[k] == "*" { + newPts = pts[:k-1] + newPts = append(newPts, h.Itoa(h.Atoi(pts[k-1])*h.Atoi(pts[k+1]))) + newPts = append(newPts, pts[k+2:]...) + inp = strings.Join(newPts, " ") + break + } + } + } + return inp +} + +type Token struct { + SubTokens []Token +} diff --git a/2020/day18/testinput b/2020/day18/testinput new file mode 100644 index 0000000..9a421d5 --- /dev/null +++ b/2020/day18/testinput @@ -0,0 +1 @@ +((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2