diff --git a/.cargo/config.toml b/.cargo/config.toml
index 13f1b3f..6fe9ded 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,21 +1,3 @@
-[target.x86_64-unknown-linux-gnu]
-linker = "clang"
-rustflags = ["-Clink-arg=-fuse-ld=lld"] 
-
-# NOTE: you must manually install https://github.com/michaeleisel/zld on mac. you can easily do this with the "brew" package manager:
-# `brew install michaeleisel/zld/zld`
-[target.x86_64-apple-darwin]
-rustflags = ["-C", "link-arg=-fuse-ld=/usr/local/bin/zld"]
-
-[target.aarch64-apple-darwin]
-rustflags = ["-C", "link-arg=-fuse-ld=/opt/homebrew/bin/zld"]
-
-[target.x86_64-pc-windows-msvc]
-linker = "rust-lld.exe"
-
-[target.wasm32-unknown-unknown]
-runner = "wasm-server-runner"
-
 [target.'cfg(all())']
 rustflags = [
     "-Wclippy::pedantic",
diff --git a/.github/workflows/dependabot.yml b/.github/workflows/dependabot.yml
new file mode 100644
index 0000000..6fce5c7
--- /dev/null
+++ b/.github/workflows/dependabot.yml
@@ -0,0 +1,11 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: daily
+
diff --git a/.github/workflows/workflows/check.yml b/.github/workflows/workflows/check.yml
new file mode 100644
index 0000000..3a0bbe2
--- /dev/null
+++ b/.github/workflows/workflows/check.yml
@@ -0,0 +1,96 @@
+permissions:
+  contents: read
+on:
+  push:
+    branches: [main]
+  pull_request:
+# Spend CI time only on latest ref: https://github.com/jonhoo/rust-ci-conf/pull/5
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+name: check
+jobs:
+  fmt:
+    runs-on: ubuntu-latest
+    name: stable / fmt
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install stable
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - name: cargo fmt --check
+        run: cargo fmt --check
+  clippy:
+    runs-on: ubuntu-latest
+    name: ${{ matrix.toolchain }} / clippy
+    permissions:
+      contents: read
+      checks: write
+    strategy:
+      fail-fast: false
+      matrix:
+        toolchain: [stable, beta]
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install ${{ matrix.toolchain }}
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.toolchain }}
+          components: clippy
+      - name: cargo clippy
+        uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          # For AoC the stub code has these so ignore them by default till
+          # we're done when this gets removed.
+          args: -- -A unused_imports -A unused_variables
+  doc:
+    runs-on: ubuntu-latest
+    name: nightly / doc
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install nightly
+        uses: dtolnay/rust-toolchain@nightly
+      - name: cargo doc
+        run: cargo doc --no-deps --all-features
+        env:
+          RUSTDOCFLAGS: --cfg docsrs
+  hack:
+    runs-on: ubuntu-latest
+    name: ubuntu / stable / features
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install stable
+        uses: dtolnay/rust-toolchain@stable
+      - name: cargo install cargo-hack
+        uses: taiki-e/install-action@cargo-hack
+      # intentionally no target specifier; see https://github.com/jonhoo/rust-ci-conf/pull/4
+      - name: cargo hack
+        run: cargo hack --feature-powerset check
+  msrv:
+    runs-on: ubuntu-latest
+    # we use a matrix here just because env can't be used in job names
+    # https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability
+    strategy:
+      matrix:
+        msrv: ["1.70"] # let/else support and OnceLock
+    name: ubuntu / ${{ matrix.msrv }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install ${{ matrix.msrv }}
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.msrv }}
+      - name: cargo +${{ matrix.msrv }} check
+        run: cargo check
diff --git a/.github/workflows/workflows/scheduled.yml b/.github/workflows/workflows/scheduled.yml
new file mode 100644
index 0000000..b99ac41
--- /dev/null
+++ b/.github/workflows/workflows/scheduled.yml
@@ -0,0 +1,52 @@
+permissions:
+  contents: read
+on:
+  push:
+    branches: [main]
+  pull_request:
+  schedule:
+    - cron:  '7 7 * * *'
+# Spend CI time only on latest ref: https://github.com/jonhoo/rust-ci-conf/pull/5
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+name: rolling
+jobs:
+  # https://twitter.com/mycoliza/status/1571295690063753218
+  nightly:
+    runs-on: ubuntu-latest
+    name: ubuntu / nightly
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install nightly
+        uses: dtolnay/rust-toolchain@nightly
+      - name: cargo generate-lockfile
+        if: hashFiles('Cargo.lock') == ''
+        run: cargo generate-lockfile
+      - name: cargo test --locked
+        run: cargo test --locked --all-features --all-targets
+  # https://twitter.com/alcuadrado/status/1571291687837732873
+  update:
+    runs-on: ubuntu-latest
+    name: ubuntu / beta / updated
+    # There's no point running this if no Cargo.lock was checked in in the
+    # first place, since we'd just redo what happened in the regular test job.
+    # Unfortunately, hashFiles only works in if on steps, so we repeat it.
+    # if: hashFiles('Cargo.lock') != ''
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install beta
+        if: hashFiles('Cargo.lock') != ''
+        uses: dtolnay/rust-toolchain@beta
+      - name: cargo update
+        if: hashFiles('Cargo.lock') != ''
+        run: cargo update
+      - name: cargo test
+        if: hashFiles('Cargo.lock') != ''
+        run: cargo test --locked --all-features --all-targets
+        env:
+          RUSTFLAGS: -D deprecated
diff --git a/.github/workflows/workflows/test.yml b/.github/workflows/workflows/test.yml
new file mode 100644
index 0000000..ff6da8e
--- /dev/null
+++ b/.github/workflows/workflows/test.yml
@@ -0,0 +1,67 @@
+permissions:
+  contents: read
+on:
+  push:
+    branches: [main]
+  pull_request:
+# Spend CI time only on latest ref: https://github.com/jonhoo/rust-ci-conf/pull/5
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+name: test
+jobs:
+  required:
+    runs-on: ubuntu-latest
+    name: ubuntu / ${{ matrix.toolchain }}
+    strategy:
+      matrix:
+        toolchain: [stable, beta]
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install ${{ matrix.toolchain }}
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.toolchain }}
+      - name: cargo generate-lockfile
+        if: hashFiles('Cargo.lock') == ''
+        run: cargo generate-lockfile
+      # https://twitter.com/jonhoo/status/1571290371124260865
+      - name: cargo test --locked
+        run: cargo test --locked --all-features --all-targets
+  minimal:
+    runs-on: ubuntu-latest
+    name: ubuntu / stable / minimal-versions
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install stable
+        uses: dtolnay/rust-toolchain@stable
+      - name: Install nightly for -Zminimal-versions
+        uses: dtolnay/rust-toolchain@nightly
+      - name: rustup default stable
+        run: rustup default stable
+      - name: cargo update -Zminimal-versions
+        run: cargo +nightly update -Zdirect-minimal-versions
+      - name: cargo test
+        run: cargo test --locked --all-features --all-targets
+  os-check:
+    runs-on: ${{ matrix.os }}
+    name: ${{ matrix.os }} / stable
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Install stable
+        uses: dtolnay/rust-toolchain@stable
+      - name: cargo generate-lockfile
+        if: hashFiles('Cargo.lock') == ''
+        run: cargo generate-lockfile
+      - name: cargo test
+        run: cargo test --locked --all-features --all-targets
diff --git a/.gitignore b/.gitignore
index 011cd3b..1eeba93 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,12 +2,8 @@
 # will have compiled files and executables
 /target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-
 # These are backup files generated by rustfmt
 **/*.rs.bk
-**/*.txt
 
+# Don't check in AoC input files per the rules.
 **/input*.txt
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..7eff795
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,982 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "addr2line"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "backtrace"
+version = "0.3.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2089b7e3f35b9dd2d0ed921ead4f6d318c27680d4a5bd167b3ee120edb105837"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "bitflags"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "327762f6e5a765692301e5bb513e0d9fef63be86bbc14528052b1cd3e6f03e07"
+
+[[package]]
+name = "cc"
+version = "1.0.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "clap"
+version = "4.0.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7db700bc935f9e43e88d00b0850dae18a63773cfbec6d8e070fccf7fef89a39"
+dependencies = [
+ "bitflags 1.3.2",
+ "clap_derive",
+ "clap_lex",
+ "is-terminal",
+ "once_cell",
+ "strsim",
+ "termcolor",
+ "terminal_size",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0177313f9f02afc995627906bbd8967e2be069f5261954222dac78290c2b9014"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "033f6b7a4acb1f358c742aaca805c939ee73b4c6209ae4318ec7aca81c42e646"
+dependencies = [
+ "os_str_bytes",
+]
+
+[[package]]
+name = "color-eyre"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a667583cca8c4f8436db8de46ea8233c42a7d9ae424a82d338f2e4675229204"
+dependencies = [
+ "backtrace",
+ "eyre",
+ "indenter",
+ "once_cell",
+ "owo-colors",
+]
+
+[[package]]
+name = "day1"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day10"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day11"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day12"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "serde_json",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day13"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "itertools",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day14"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day15"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "itertools",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day16"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day17"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "itertools",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day18"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "grid",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day19"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "rand",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day2"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day20"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day21"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "itertools",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day22"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day23"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day24"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "itertools",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day25"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "itertools",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day3"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day4"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "md5",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day5"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day6"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day7"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day8"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "day9"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "color-eyre",
+ "itertools",
+ "slab_tree",
+ "strum",
+ "strum_macros",
+]
+
+[[package]]
+name = "either"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
+
+[[package]]
+name = "errno"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a258e46cdc063eb8519c00b9fc845fc47bcfca4130e2f08e88665ceda8474245"
+dependencies = [
+ "libc",
+ "windows-sys 0.52.0",
+]
+
+[[package]]
+name = "eyre"
+version = "0.6.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80f656be11ddf91bd709454d15d5bd896fbaf4cc3314e69349e4d1569f5b46cd"
+dependencies = [
+ "indenter",
+ "once_cell",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe9006bed769170c11f845cf00c7c1e9092aeb3f268e007c3e760ac68008070f"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "gimli"
+version = "0.28.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
+
+[[package]]
+name = "grid"
+version = "0.1.0"
+source = "git+https://github.com/jmchacon/advent.git#abf732bb17f13fffc454dd5c69d73c4176fc4bab"
+
+[[package]]
+name = "heck"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
+
+[[package]]
+name = "hermit-abi"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d77f7ec81a6d05a3abb01ab6eb7590f6083d08449fe5a1c8b1e620283546ccb7"
+
+[[package]]
+name = "indenter"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce23b50ad8242c51a442f3ff322d56b02f08852c77e4c0b4d3fd684abc89c683"
+
+[[package]]
+name = "io-lifetimes"
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diff --git a/Cargo.toml b/Cargo.toml
index a99b948..bf8dc69 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -54,6 +54,8 @@ default-members = [
     "./day25",
 ]
 
+resolver = "2"
+
 [profile.test]
 opt-level = 3
 
diff --git a/day1/src/main.rs b/day1/src/main.rs
index 094c5eb..cae8b27 100644
--- a/day1/src/main.rs
+++ b/day1/src/main.rs
@@ -47,7 +47,7 @@ fn main() -> Result<()> {
             }
         }
         println!("part1: Ended on {floor}");
-        println!("part2: {} first floor -1 pos", part2);
+        println!("part2: {part2} first floor -1 pos");
     }
 
     Ok(())
diff --git a/day10/src/main.rs b/day10/src/main.rs
index 8c4749d..a8bc4b0 100644
--- a/day10/src/main.rs
+++ b/day10/src/main.rs
@@ -26,7 +26,7 @@ fn main() -> Result<()> {
                 println!("{i} - {cur}");
             }
             let mut new = String::new();
-            let bytes = cur.as_str().as_bytes();
+            let bytes = cur.as_bytes();
             let mut prev = bytes[0];
             let mut repeat = 1;
             let mut cc: [u8; 1] = [0];
diff --git a/day15/src/main.rs b/day15/src/main.rs
index c77cb7b..e9073c3 100644
--- a/day15/src/main.rs
+++ b/day15/src/main.rs
@@ -57,12 +57,12 @@ fn main() -> Result<()> {
 
     let mut best = i64::MIN;
     let mut best_with_500_cal = i64::MIN;
-    let l: i64 = ingrediants.len().try_into()?;
+    let inglen: i64 = ingrediants.len().try_into()?;
 
     for j in (1..100_i64)
         .permutations(ingrediants.len())
         .filter(|x| x.iter().sum::<i64>() == 100)
-        .chain(iter::once(vec![100 / l; ingrediants.len()]))
+        .chain(iter::once(vec![100 / inglen; ingrediants.len()]))
     {
         let (mut c, mut d, mut f, mut t, mut cal) = (0, 0, 0, 0, 0);
         for (pos, x) in j.iter().enumerate() {
diff --git a/day18/src/main.rs b/day18/src/main.rs
index 222fdca..c8fe45f 100644
--- a/day18/src/main.rs
+++ b/day18/src/main.rs
@@ -39,7 +39,7 @@ fn main() -> Result<()> {
     let mut grid = Grid::<Light>::new(lines[0].len(), lines.len());
     for (line_num, line) in lines.iter().enumerate() {
         for (pos, b) in line.as_bytes().iter().enumerate() {
-            let l = Location(pos, line_num);
+            let l = Location(pos.try_into().unwrap(), line_num.try_into().unwrap());
             match b {
                 b'#' => grid.add(&l, Light::On),
                 b'.' => {}
@@ -89,18 +89,33 @@ fn step(grid: &mut Grid<Light>, corners: bool) {
     // force the corners to remain.
     if corners {
         grid.add(&Location(0, 0), Light::On);
-        grid.add(&Location(grid.width() - 1, 0), Light::On);
-        grid.add(&Location(0, grid.height() - 1), Light::On);
-        grid.add(&Location(grid.width() - 1, grid.height() - 1), Light::On);
+        grid.add(
+            &Location((grid.width() - 1).try_into().unwrap(), 0),
+            Light::On,
+        );
+        grid.add(
+            &Location(0, (grid.height() - 1).try_into().unwrap()),
+            Light::On,
+        );
+        grid.add(
+            &Location(
+                (grid.width() - 1).try_into().unwrap(),
+                (grid.height() - 1).try_into().unwrap(),
+            ),
+            Light::On,
+        );
     }
     for gr in grid.iter() {
         let l = gr.0;
         let mut g = gr.1.clone();
         if corners
             && (l == Location(0, 0)
-                || l == Location(grid.width() - 1, 0)
-                || l == Location(0, grid.height() - 1)
-                || l == Location(grid.width() - 1, grid.height() - 1))
+                || l == Location((grid.width() - 1).try_into().unwrap(), 0)
+                || l == Location(0, (grid.height() - 1).try_into().unwrap())
+                || l == Location(
+                    (grid.width() - 1).try_into().unwrap(),
+                    (grid.height() - 1).try_into().unwrap(),
+                ))
         {
             g = Light::On;
         } else {
diff --git a/day2/src/main.rs b/day2/src/main.rs
index 15cdd60..cb486d6 100644
--- a/day2/src/main.rs
+++ b/day2/src/main.rs
@@ -29,11 +29,11 @@ fn main() -> Result<()> {
         let l = parts[0].parse::<u32>()?;
         let w = parts[1].parse::<u32>()?;
         let h = parts[2].parse::<u32>()?;
-        let areas = vec![l * w, w * h, h * l];
+        let areas = [l * w, w * h, h * l];
         total += areas.iter().map(|a| 2 * a).sum::<u32>();
         total += areas.iter().min().unwrap();
 
-        let perimeters = vec![2 * w + 2 * h, 2 * l + 2 * h, 2 * w + 2 * l];
+        let perimeters = [2 * w + 2 * h, 2 * l + 2 * h, 2 * w + 2 * l];
         let vol = l * w * h;
         ribbon += perimeters.iter().min().unwrap() + vol;
     }