10 files changed, 1327 insertions, 0 deletions
diff --git a/09/input b/09/input
new file mode 100644
index 0000000..b5ee756
--- /dev/null
+++ b/09/input
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diff --git a/10/Cargo.toml b/10/Cargo.toml
new file mode 100644
index 0000000..6b36e1c
--- /dev/null
+++ b/10/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "advent_10"
+version = "0.1.0"
+authors = ["Irene Knapp <ireneista@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+advent_lib = { path = "../lib" }
+
+[dev-dependencies]
+assert_cmd = "0.10"
diff --git a/10/input b/10/input
new file mode 100644
index 0000000..5b21a23
--- /dev/null
+++ b/10/input
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diff --git a/10/input.medium b/10/input.medium
new file mode 100644
index 0000000..e6376dc
--- /dev/null
+++ b/10/input.medium
@@ -0,0 +1,31 @@
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diff --git a/10/input.small b/10/input.small
new file mode 100644
index 0000000..ec4a03f
--- /dev/null
+++ b/10/input.small
@@ -0,0 +1,11 @@
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diff --git a/10/src/main.rs b/10/src/main.rs
new file mode 100644
index 0000000..d504711
--- /dev/null
+++ b/10/src/main.rs
@@ -0,0 +1,67 @@
+use advent_lib::prelude::*;
+
+use std::convert::TryFrom;
+
+
+fn main() -> Result<()> {
+  let mut args = std::env::args();
+  if args.len() != 2 {
+    eprintln!("Usage: advent input");
+  }
+  let _ = args.next();
+  let filename = args.next().unwrap();
+
+  let input = advent_lib::read_lines_file(&filename)?;
+
+  let mut adaptors: Vec<i64> = Vec::new();
+  for line in &input {
+    adaptors.push(line.parse::<i64>().unwrap());
+  }
+  adaptors.sort();
+
+  let mut buckets = Vec::new();
+  buckets.push(0);
+  buckets.push(0);
+  buckets.push(0);
+  buckets.push(0);
+
+  for i in 0 .. adaptors.len() {
+    let mut prev_joltage = 0;
+    if i > 0 {
+      prev_joltage = adaptors[i - 1];
+    }
+    let difference = adaptors[i] - prev_joltage;
+    buckets[usize::try_from(difference).unwrap()] += 1;
+  }
+
+  buckets[3] += 1;
+
+  println!("{}", buckets[1]*buckets[3]);
+
+  let mut reversed_adaptors = Vec::new();
+  for i in 0 .. adaptors.len() {
+    reversed_adaptors.push(adaptors[adaptors.len() - i - 1]);
+  }
+  reversed_adaptors.push(0);
+
+  let mut memoized_counts: Vec<i64> = Vec::new();
+  memoized_counts.push(1);
+
+  for i in 1 .. reversed_adaptors.len() {
+    let mut count = 0;
+    for j in 1 .. i+1 {
+      let difference = reversed_adaptors[i - j] - reversed_adaptors[i];
+      if difference <= 3 {
+        count += memoized_counts[i - j];
+      } else {
+        break;
+      }
+    }
+    memoized_counts.push(count);
+  }
+
+  println!("{}", memoized_counts[memoized_counts.len()-1]);
+
+  Ok(())
+}
+
diff --git a/10/tests/main.rs b/10/tests/main.rs
new file mode 100644
index 0000000..e0b01e8
--- /dev/null
+++ b/10/tests/main.rs
@@ -0,0 +1,14 @@
+use assert_cmd::prelude::*;
+use std::process::Command;
+
+
+#[test]
+fn personal_input() -> Result<(), Box<dyn std::error::Error>> {
+  let mut command = Command::cargo_bin("advent_10")?;
+
+  command.arg("input");
+  command.assert().success().stdout("3034\n259172170858496\n");
+
+  Ok(())
+}
+
diff --git a/Cargo.lock b/Cargo.lock
index 4be6ce1..272770c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -75,6 +75,14 @@ dependencies = [
 ]
 
 [[package]]
+name = "advent_10"
+version = "0.1.0"
+dependencies = [
+ "advent_lib",
+ "assert_cmd",
+]
+
+[[package]]
 name = "advent_lib"
 version = "0.1.0"
 
diff --git a/Cargo.nix b/Cargo.nix
index 37c620f..f5b6f81 100644
--- a/Cargo.nix
+++ b/Cargo.nix
@@ -108,6 +108,26 @@ rec {
       # File a bug if you depend on any for non-debug work!
       debug = internal.debugCrate { inherit packageId; };
     };
+    "advent_09" = rec {
+      packageId = "advent_09";
+      build = internal.buildRustCrateWithFeatures {
+        packageId = "advent_09";
+      };
+
+      # Debug support which might change between releases.
+      # File a bug if you depend on any for non-debug work!
+      debug = internal.debugCrate { inherit packageId; };
+    };
+    "advent_10" = rec {
+      packageId = "advent_10";
+      build = internal.buildRustCrateWithFeatures {
+        packageId = "advent_10";
+      };
+
+      # Debug support which might change between releases.
+      # File a bug if you depend on any for non-debug work!
+      debug = internal.debugCrate { inherit packageId; };
+    };
     "advent_lib" = rec {
       packageId = "advent_lib";
       build = internal.buildRustCrateWithFeatures {
@@ -348,6 +368,56 @@ rec {
         ];
         
       };
+      "advent_09" = rec {
+        crateName = "advent_09";
+        version = "0.1.0";
+        edition = "2018";
+        crateBin = [
+          { name = "advent_09"; path = "src/main.rs"; }
+        ];
+        src = (builtins.filterSource sourceFilter ./09);
+        authors = [
+          "Irene Knapp <ireneista@gmail.com>"
+        ];
+        dependencies = [
+          {
+            name = "advent_lib";
+            packageId = "advent_lib";
+          }
+        ];
+        devDependencies = [
+          {
+            name = "assert_cmd";
+            packageId = "assert_cmd";
+          }
+        ];
+        
+      };
+      "advent_10" = rec {
+        crateName = "advent_10";
+        version = "0.1.0";
+        edition = "2018";
+        crateBin = [
+          { name = "advent_10"; path = "src/main.rs"; }
+        ];
+        src = (builtins.filterSource sourceFilter ./10);
+        authors = [
+          "Irene Knapp <ireneista@gmail.com>"
+        ];
+        dependencies = [
+          {
+            name = "advent_lib";
+            packageId = "advent_lib";
+          }
+        ];
+        devDependencies = [
+          {
+            name = "assert_cmd";
+            packageId = "assert_cmd";
+          }
+        ];
+        
+      };
       "advent_lib" = rec {
         crateName = "advent_lib";
         version = "0.1.0";
diff --git a/Cargo.toml b/Cargo.toml
index f10de33..35009be 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,4 +10,5 @@ members = [
   "07",
   "08",
   "09",
+  "10",
 ]