diff --git a/BUILD.bazel b/BUILD.bazel
new file mode 100644
index 0000000..e69de29
diff --git a/Cargo.toml b/Cargo.toml
index 5e652c1..3f12d39 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,6 +10,10 @@ expensive_tests = []
 [dependencies]
 itertools = "0"
 regex = "1"
+matrixmultiply = "0.3.2"
 ndarray = "0"
 scan_fmt = "0"
 thiserror = "1"
+
+[patch.crates-io]
+matrixmultiply = { git = "https://github.com/minor-fixes/matrixmultiply" }
diff --git a/WORKSPACE b/WORKSPACE
new file mode 100644
index 0000000..63bc9b0
--- /dev/null
+++ b/WORKSPACE
@@ -0,0 +1,39 @@
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "rules_rust",
+    sha256 = "531bdd470728b61ce41cf7604dc4f9a115983e455d46ac1d0c1632f613ab9fc3",
+    strip_prefix = "rules_rust-d8238877c0e552639d3e057aadd6bfcf37592408",
+    urls = [
+        # `main` branch as of 2021-08-23
+        "https://github.com/bazelbuild/rules_rust/archive/d8238877c0e552639d3e057aadd6bfcf37592408.tar.gz",
+    ],
+)
+
+load("@rules_rust//rust:repositories.bzl", "rust_repositories")
+
+rust_repositories(
+    edition = "2018",
+    version = "1.53.0",
+)
+
+load("//third_party/rules_rust:crate_universe_defaults.bzl", "DEFAULT_SHA256_CHECKSUMS", "DEFAULT_URL_TEMPLATE")
+load("@rules_rust//crate_universe:defs.bzl", "crate", "crate_universe")
+
+crate_universe(
+    name = "rust_dependencies",
+    cargo_toml_files = [
+        "//:Cargo.toml",
+    ],
+    resolver_download_url_template = DEFAULT_URL_TEMPLATE,
+    resolver_sha256s = DEFAULT_SHA256_CHECKSUMS,
+    #overrides = {
+    #    "example-sys": crate.override(
+    #        extra_build_script_env_vars = {"PATH": "/usr/bin"},
+    #    ),
+    #},
+)
+
+load("@rust_dependencies//:defs.bzl", "pinned_rust_install")
+
+pinned_rust_install()
diff --git a/bazel-advent_2020 b/bazel-advent_2020
new file mode 120000
index 0000000..9ec4343
--- /dev/null
+++ b/bazel-advent_2020
@@ -0,0 +1 @@
+/home/bminor/.cache/bazel/_bazel_bminor/d88beeac5653d99db5c40c4be2ee913e/execroot/__main__
\ No newline at end of file
diff --git a/bazel-bin b/bazel-bin
new file mode 120000
index 0000000..3873942
--- /dev/null
+++ b/bazel-bin
@@ -0,0 +1 @@
+/home/bminor/.cache/bazel/_bazel_bminor/d88beeac5653d99db5c40c4be2ee913e/execroot/__main__/bazel-out/k8-fastbuild/bin
\ No newline at end of file
diff --git a/bazel-out b/bazel-out
new file mode 120000
index 0000000..82f2d97
--- /dev/null
+++ b/bazel-out
@@ -0,0 +1 @@
+/home/bminor/.cache/bazel/_bazel_bminor/d88beeac5653d99db5c40c4be2ee913e/execroot/__main__/bazel-out
\ No newline at end of file
diff --git a/bazel-testlogs b/bazel-testlogs
new file mode 120000
index 0000000..264709a
--- /dev/null
+++ b/bazel-testlogs
@@ -0,0 +1 @@
+/home/bminor/.cache/bazel/_bazel_bminor/d88beeac5653d99db5c40c4be2ee913e/execroot/__main__/bazel-out/k8-fastbuild/testlogs
\ No newline at end of file
diff --git a/src/BUILD.bazel b/src/BUILD.bazel
new file mode 100644
index 0000000..e5c9067
--- /dev/null
+++ b/src/BUILD.bazel
@@ -0,0 +1,9 @@
+load("@rust_dependencies//:defs.bzl", "build_crates_from", "crates_from")
+load("@rules_rust//rust:rust.bzl", "rust_library")
+
+rust_library(
+    name = "advent_2020",
+    srcs = glob(["*.rs"]),
+    visibility = ["//src/bin:__pkg__"],
+    deps = crates_from("//:Cargo.toml"),
+)
diff --git a/src/bin/BUILD.bazel b/src/bin/BUILD.bazel
new file mode 100644
index 0000000..ed56e49
--- /dev/null
+++ b/src/bin/BUILD.bazel
@@ -0,0 +1,22 @@
+load("@rust_dependencies//:defs.bzl", "build_crates_from", "crates_from")
+load("@rules_rust//rust:rust.bzl", "rust_binary")
+
+DAY_STRINGS = [
+    "day_" + str(num) if num >= 10 else "day_0" + str(num)
+    for num in range(1, 25)
+]
+
+[
+    rust_binary(
+        name = day_str,
+        srcs = ["{}/main.rs".format(day_str)],
+        deps = ["//src:advent_2020"],
+    )
+    for day_str in DAY_STRINGS
+]
+
+#rust_binary(
+#    name = "day_03",
+#    srcs = ["day_03/main.rs"],
+#    deps = ["//src:advent_2020"],
+#)
diff --git a/third_party/rules_rust/BUILD.bazel b/third_party/rules_rust/BUILD.bazel
new file mode 100644
index 0000000..e69de29
diff --git a/third_party/rules_rust/crate_universe_defaults.bzl b/third_party/rules_rust/crate_universe_defaults.bzl
new file mode 100644
index 0000000..79804dd
--- /dev/null
+++ b/third_party/rules_rust/crate_universe_defaults.bzl
@@ -0,0 +1,14 @@
+"""A helper module defining generated information about crate_universe dependencies"""
+
+# This global should match the current release of `crate_unvierse`.
+DEFAULT_URL_TEMPLATE = "https://github.com/bazelbuild/rules_rust/releases/download/crate_universe-13/crate_universe_resolver-{host_triple}{extension}"
+
+# Note that if any additional platforms are added here, the pipeline defined
+# by `create_universe.yaml` should also be updated
+DEFAULT_SHA256_CHECKSUMS = {
+    "aarch64-apple-darwin": "c6017cd8a4fee0f1796a8db184e9d64445dd340b7f48a65130d7ee61b97051b4",
+    "aarch64-unknown-linux-gnu": "d0a310b03b8147e234e44f6a93e8478c260a7c330e5b35515336e7dd67150f35",
+    "x86_64-apple-darwin": "762f1c77b3cf1de8e84d7471442af1314157efd90720c7e1f2fff68556830ee2",
+    "x86_64-pc-windows-gnu": "c44bd97373d690587e74448b13267077d133f04e89bedfc9d521ae8ba55dddb9",
+    "x86_64-unknown-linux-gnu": "aebf51af6a3dd33fdac463b35b0c3f4c47ab93e052099199673289e2025e5824",
+}