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Author SHA1 Message Date
24669a60f0
wtf happened in day06
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Build and test / test (push) Failing after 2m40s
2023-12-06 16:25:34 +11:00

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@ -20,41 +20,48 @@ const Race = struct {
}; };
fn solve(alloc: mem.Allocator, input: []const u8) !Solution { fn solve(alloc: mem.Allocator, input: []const u8) !Solution {
var result: usize = 1; const races: []Race = r: {
{
var it = util.splitLines(input); var it = util.splitLines(input);
const times = try util.parseIntsScalar(usize, alloc, it.next().?[10..], .{}); const times = try util.parseIntsScalar(usize, alloc, it.next().?[10..], .{});
const distances = try util.parseIntsScalar(usize, alloc, it.next().?[10..], .{}); const distances = try util.parseIntsScalar(usize, alloc, it.next().?[10..], .{});
defer alloc.free(times); defer alloc.free(times);
defer alloc.free(distances); defer alloc.free(distances);
var al = try std.ArrayList(Race).initCapacity(alloc, times.len);
for (times, distances) |t, d| {
try al.append(.{ .time = t, .distance = d });
}
break :r try al.toOwnedSlice();
};
defer alloc.free(races);
for (times, distances) |time, minDistance| { const bigRace: Race = r: {
var it = util.splitLines(input);
var vals: [2]usize = undefined;
for (0..vals.len) |i| {
const line = try mem.replaceOwned(u8, alloc, it.next().?[10..], " ", "");
defer alloc.free(line);
vals[i] = try std.fmt.parseInt(usize, line, 10);
}
break :r .{ .time = vals[0], .distance = vals[1] };
};
var result: usize = 1;
for (races) |race| {
var winning: usize = 0; var winning: usize = 0;
for (0..time - 1) |speed| { for (0..race.time - 1) |speed| {
const distance = speed * (time - speed); const distance = speed * (race.time - speed);
if (distance > minDistance) winning += 1; if (distance > race.distance) winning += 1;
} }
result *= winning; result *= winning;
} }
}
var result2: usize = 1; var result2: usize = 1;
{
var it = util.splitLines(input);
var td: [2]usize = undefined;
for (0..td.len) |i| {
const line = try mem.replaceOwned(u8, alloc, it.next().?[10..], " ", "");
defer alloc.free(line);
td[i] = try std.fmt.parseInt(usize, line, 10);
}
var winning2: usize = 0; var winning2: usize = 0;
for (0..td[0] - 1) |speed| { for (0..bigRace.time - 1) |speed| {
const distance = speed * (td[0] - speed); const distance = speed * (bigRace.time - speed);
if (distance > td[1]) winning2 += 1; if (distance > bigRace.distance) winning2 += 1;
} }
result2 *= winning2; result2 *= winning2;
}
return .{ .a = result, .b = result2 }; return .{ .a = result, .b = result2 };
} }
@ -74,5 +81,5 @@ test "gold" {
\\Distance: 9 40 200 \\Distance: 9 40 200
; ;
const sln = try solve(std.testing.allocator, input); const sln = try solve(std.testing.allocator, input);
try std.testing.expectEqual(@as(usize, 71503), sln.b); try std.testing.expectEqual(@as(usize, 288), sln.b);
} }