Day Six

4 files changed, 67 insertions, 0 deletions

diff --git a/2022/nim/day06/src/main.nim b/2022/nim/day06/src/main.nim
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+# Day 6: Tuning Trouble
+import std/[os, strutils, sets]
+
+let input = paramStr(1).readFile().strip().split("\n")[0]
+
+iterator slide(input: string, num: int): string =
+  for i in 0 ..< input.len - num:
+    var result: string
+    for j in 0 ..< num:
+      result &= input[i+j]
+    yield result
+
+var i = 4
+for window in input.slide(4):
+  if window.toHashSet.len == 4:
+    break
+  inc i
+echo i
+
+i = 14
+for window in input.slide(14):
+  if window.toHashSet.len == 14:
+    break
+  inc i
+echo i
diff --git a/2022/rust/day06/Cargo.lock b/2022/rust/day06/Cargo.lock
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+++ b/2022/rust/day06/Cargo.lock
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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day06"
+version = "0.1.0"
diff --git a/2022/rust/day06/Cargo.toml b/2022/rust/day06/Cargo.toml
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+++ b/2022/rust/day06/Cargo.toml
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+[package]
+name = "day06"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2022/rust/day06/src/main.rs b/2022/rust/day06/src/main.rs
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+++ b/2022/rust/day06/src/main.rs
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+use std::collections::HashSet;
+use std::env;
+use std::fs;
+
+fn main() {
+    let args = env::args().nth(1).expect("missing input");
+    let input = fs::read_to_string(args).unwrap();
+    let signal: Vec<char> = input.trim().chars().collect();
+
+    let depth = 4;
+    for (i, c) in signal.windows(depth).enumerate() {
+        // why can rust not infer the type of HashSet?
+        // https://stackoverflow.com/questions/62949404/
+        if HashSet::<_>::from_iter(c).len() == depth {
+            println!("{}", i + depth);
+            break;
+        }
+    }
+
+    let depth = 14;
+    for (i, c) in signal.windows(depth).enumerate() {
+        if HashSet::<_>::from_iter(c).len() == depth {
+            println!("{}", i + depth);
+            break;
+        }
+    }
+}