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carbon-lang/examples/advent2024/day1_part2.carbon
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Richard Smithandjosh11b 4ddba4ab1e Modernize advent of code examples (#6496)
* Use generics in more places.
* Use `ref` in more places.
* Use `for` in more places.
* Use a little bit of C++ interop.
* Use an adapter for the `char`-or-EOF result of reading a char instead
of pure `i32`, and use char literals where possible.

---------

Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com>
2025-12-17 23:26:26 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// https://adventofcode.com/2024/day/1
import Core library "io";
import library "day1_common";
import library "sort";
fn Run() {
var a: array(i32, 1000);
var b: array(i32, 1000);
let n: i32 = ReadInputs(ref a, ref b);
Quicksort(ref a, 0, n);
Quicksort(ref b, 0, n);
var i: i32 = 0;
var j: i32 = 0;
var similarity: i32 = 0;
while (i < n and j < n) {
if (a[i] < b[j]) {
++i;
} else {
if (a[i] == b[j]) {
similarity += b[j];
}
++j;
}
}
Core.Print(similarity);
}