67 lines
1.7 KiB
Zig
67 lines
1.7 KiB
Zig
const std = @import("std");
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const Allocator = std.mem.Allocator;
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const List = std.ArrayList;
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const Map = std.AutoHashMap;
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const StrMap = std.StringHashMap;
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const BitSet = std.DynamicBitSet;
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const Str = []const u8;
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const util = @import("util.zig");
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const gpa = util.gpa;
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const data = @embedFile("../data/day01.txt");
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pub fn main() !void {
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var it = tokenize(u8, data, "\n");
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// Not sure if allocating a massive buffer and tracking the size is the right approach?
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var buffer: [1000]u16 = undefined;
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var i: usize = 0;
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while (it.next()) |line| {
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const int = try parseInt(u16, line, 10);
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buffer[i] = int;
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// Can we use continue expression?
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i = i + 1;
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}
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var answer: u32 = 0;
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outer: for (buffer[0..i]) |a, j| {
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for (buffer[(j+1)..i]) |b| {
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if (a + b == 2020) {
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answer = @as(u32, a) * b;
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break :outer;
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}
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}
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}
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print("{d}\n", .{answer});
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}
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// Useful stdlib functions
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const tokenize = std.mem.tokenize;
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const split = std.mem.split;
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const indexOf = std.mem.indexOfScalar;
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const indexOfAny = std.mem.indexOfAny;
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const indexOfStr = std.mem.indexOfPosLinear;
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const lastIndexOf = std.mem.lastIndexOfScalar;
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const lastIndexOfAny = std.mem.lastIndexOfAny;
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const lastIndexOfStr = std.mem.lastIndexOfLinear;
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const trim = std.mem.trim;
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const sliceMin = std.mem.min;
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const sliceMax = std.mem.max;
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const parseInt = std.fmt.parseInt;
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const parseFloat = std.fmt.parseFloat;
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const min = std.math.min;
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const min3 = std.math.min3;
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const max = std.math.max;
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const max3 = std.math.max3;
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const print = std.debug.print;
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const assert = std.debug.assert;
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const sort = std.sort.sort;
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const asc = std.sort.asc;
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const desc = std.sort.desc;
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