88 lines
2.1 KiB
Zig
88 lines
2.1 KiB
Zig
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const std = @import("std");
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const Pair = struct {
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opening: u8,
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closing: u8,
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score: u32,
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};
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const pairs = [4]Pair{
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Pair{
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.opening = '(',
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.closing = ')',
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.score = 3,
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},
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Pair{
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.opening = '[',
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.closing = ']',
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.score = 57,
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},
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Pair{
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.opening = '{',
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.closing = '}',
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.score = 1197,
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},
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Pair{
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.opening = '<',
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.closing = '>',
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.score = 25137,
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},
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};
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pub fn main() !void {
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var alloc = std.heap.GeneralPurposeAllocator(.{}){};
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defer std.debug.assert(!alloc.deinit());
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var gpa = &alloc.allocator;
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const stdin = std.io.getStdIn().reader();
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var res: u32 = 0;
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var scores = std.ArrayList(u64).init(gpa);
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defer scores.deinit();
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var tmp: [256]u8 = undefined;
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while (try stdin.readUntilDelimiterOrEof(&tmp, '\n')) |line| {
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var stack = std.ArrayList(u8).init(gpa);
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defer stack.deinit();
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var corrupt = false;
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for (line) |char| {
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for (pairs) |pair| {
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if (char == pair.opening) {
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try stack.append(char);
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}
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if (char == pair.closing) {
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var matching = stack.pop();
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if (matching != pair.opening) {
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res += pair.score;
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corrupt = true;
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}
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}
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}
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}
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if (!corrupt and stack.items.len > 0) {
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var score: u64 = 0;
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std.mem.reverse(u8, stack.items);
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for (stack.items) |char| {
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score *= 5;
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for (pairs) |pair, i| {
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if (char == pair.opening) {
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score += (@intCast(u64, i) + 1);
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}
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}
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}
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try scores.append(score);
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}
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}
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std.sort.sort(u64, scores.items, {}, comptime std.sort.asc(u64));
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var middleScore = scores.items[@divFloor(scores.items.len, 2)];
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std.debug.print("{}\n", .{res});
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std.debug.print("{}\n", .{middleScore});
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}
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