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Lucile Rose Nihlen
31cc20f6e3
As discussed in the 2026-06-14 toolchain open meeting, `Range` is a better fit for the prelude than as a general library in `Core`. This PR moves `Range` into the prelude, and updates the build infrastructure and various tests to reflect that change.
29 lines
730 B
Plaintext
29 lines
730 B
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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// https://adventofcode.com/2024/day/12
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import Core library "io";
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import library "day12_common";
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import library "io_utils";
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fn Run() {
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var map: Map = Map.Read();
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var regions: DisjointSetForest = MakeRegions(map);
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var total: i32 = 0;
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for (i: i32 in Core.Range(140 * 140)) {
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if (regions.Lookup(i) == i) {
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let area: i32 = regions.Weight(i);
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let internal_edges: i32 = regions.Unions(i);
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let perimeter: i32 = area * 4 - internal_edges * 2;
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total += area * perimeter;
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}
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}
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Core.Print(total);
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}
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