72 lines
1.8 KiB
Zig
72 lines
1.8 KiB
Zig
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const std = @import("std");
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const mem = std.mem;
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const fmt = std.fmt;
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const input = @embedFile("input");
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pub fn main() !void {
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var count: usize = 0;
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// Iterate through the lines
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var lines = mem.split(u8, input, "\n");
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while (lines.next()) |line| {
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// If line is empty, ignore
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if (line.len == 0) continue;
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var limits: [2][2]usize = undefined;
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//std.debug.print("{s}\n", .{line});
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// Which elf
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var elf: usize = 0;
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// Which limit
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var limit: usize = 0;
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// Start of slice
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var start: usize = 0;
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for (line) |char, index| {
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if (char == '-') {
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const number = fmt.parseInt(usize, line[start..index], 10) catch 0;
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//std.debug.print("{}\n", .{number});
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limits[elf][limit] = number;
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start = index + 1;
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limit += 1;
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// 10-20,30-40
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// ^
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}
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if (char == ',') {
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const number = fmt.parseInt(usize, line[start..index], 10) catch 0;
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//std.debug.print("{}\n", .{number});
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limits[elf][limit] = number;
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start = index + 1;
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elf += 1;
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limit = 0;
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// 10-20,30-40
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// ^
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}
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if (index == line.len - 1) {
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const number = fmt.parseInt(usize, line[start..], 10) catch 0;
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//std.debug.print("{}\n", .{number});
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limits[elf][limit] = number;
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}
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}
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// Check if they overlap
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if ((limits[0][0] <= limits[1][0] and limits[0][1] >= limits[1][1]) or
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(limits[1][0] <= limits[0][0] and limits[1][1] >= limits[0][1])) {
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count += 1;
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}
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}
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std.debug.print("{}\n", .{count});
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}
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