From 93149d9570cd7d7a2ce73e71c144a1ea20c3b771 Mon Sep 17 00:00:00 2001
From: FiveMovesAhead <ying@tig.foundation>
Date: Mon, 1 Dec 2025 15:21:17 +0000
Subject: [PATCH] Submitted knapsack/dynamic

---
 tig-algorithms/src/knapsack/dynamic/README.md | 23 +++++
 tig-algorithms/src/knapsack/dynamic/mod.rs    | 93 +++++++++++++++++++
 tig-algorithms/src/knapsack/mod.rs            |  3 +-
 3 files changed, 118 insertions(+), 1 deletion(-)
 create mode 100644 tig-algorithms/src/knapsack/dynamic/README.md
 create mode 100644 tig-algorithms/src/knapsack/dynamic/mod.rs

diff --git a/tig-algorithms/src/knapsack/dynamic/README.md b/tig-algorithms/src/knapsack/dynamic/README.md
new file mode 100644
index 00000000..2962f15b
--- /dev/null
+++ b/tig-algorithms/src/knapsack/dynamic/README.md
@@ -0,0 +1,23 @@
+# TIG Code Submission
+
+## Submission Details
+
+* **Challenge Name:** knapsack
+* **Algorithm Name:** dynamic
+* **Copyright:** 2024 Uncharted Trading Limited
+* **Identity of Submitter:** Uncharted Trading Limited
+* **Identity of Creator of Algorithmic Method:** null
+* **Unique Algorithm Identifier (UAI):** null
+
+## License
+
+The files in this folder are under the following licenses:
+* TIG Benchmarker Outbound License
+* TIG Commercial License
+* TIG Inbound Game License
+* TIG Innovator Outbound Game License
+* TIG Open Data License
+* TIG THV Game License
+
+Copies of the licenses can be obtained at:
+https://github.com/tig-foundation/tig-monorepo/tree/main/docs/licenses
\ No newline at end of file
diff --git a/tig-algorithms/src/knapsack/dynamic/mod.rs b/tig-algorithms/src/knapsack/dynamic/mod.rs
new file mode 100644
index 00000000..9d1e4ebc
--- /dev/null
+++ b/tig-algorithms/src/knapsack/dynamic/mod.rs
@@ -0,0 +1,93 @@
+use anyhow::{anyhow, Result};
+use serde_json::{Map, Value};
+use tig_challenges::knapsack::*;
+
+
+pub fn solve_challenge(
+    challenge: &Challenge,
+    save_solution: &dyn Fn(&Solution) -> Result<()>,
+    hyperparameters: &Option<Map<String, Value>>,
+) -> Result<()> {
+    Err(anyhow!("This algorithm is no longer compatible."))
+}
+
+// Old code that is no longer compatible
+#[cfg(none)]
+mod dead_code {
+    use tig_challenges::knapsack::*;
+
+
+    pub fn solve_challenge(challenge: &Challenge) -> anyhow::Result<Option<Solution>> {
+        let mut solution = Solution {
+            sub_solutions: Vec::new(),
+        };
+        for sub_instance in &challenge.sub_instances {
+            match solve_sub_instance(sub_instance)? {
+                Some(sub_solution) => solution.sub_solutions.push(sub_solution),
+                None => return Ok(None),
+            }
+        }
+        Ok(Some(solution))
+    }
+
+    pub fn solve_sub_instance(challenge: &SubInstance) -> anyhow::Result<Option<SubSolution>> {
+        let max_weight = challenge.max_weight;
+        let baseline_value = challenge.baseline_value;
+        let num_items = challenge.num_items;
+
+        // Sort items by value-to-weight ratio in descending order
+        let mut sorted_items: Vec<usize> = (0..num_items).collect();
+        sorted_items.sort_by(|&a, &b| {
+            let ratio_a = challenge.values[a] as f64 / challenge.weights[a] as f64;
+            let ratio_b = challenge.values[b] as f64 / challenge.weights[b] as f64;
+            ratio_b.partial_cmp(&ratio_a).unwrap()
+        });
+
+        // Initialize combinations with a single empty combo
+        let mut combinations: Vec<(Vec<bool>, u32, u32)> = vec![(vec![false; num_items], 0, 0)];
+
+        let mut items = Vec::new();
+        for &item in &sorted_items {
+            // Create new combos with the current item
+            let mut new_combinations: Vec<(Vec<bool>, u32, u32)> = combinations
+                .iter()
+                .map(|(combo, value, weight)| {
+                    let mut new_combo = combo.clone();
+                    new_combo[item] = true;
+                    (
+                        new_combo,
+                        value + challenge.values[item],
+                        weight + challenge.weights[item],
+                    )
+                })
+                .filter(|&(_, _, weight)| weight <= max_weight) // Keep only combos within weight limit
+                .collect();
+
+            // Check if any new combination meets the minimum value requirement
+            if let Some((combo, _, _)) = new_combinations
+                .iter()
+                .find(|&&(_, value, _)| value >= baseline_value)
+            {
+                items = combo
+                    .iter()
+                    .enumerate()
+                    .filter_map(|(i, &included)| if included { Some(i) } else { None })
+                    .collect();
+                break;
+            }
+
+            // Merge new_combinations with existing combinations
+            combinations.append(&mut new_combinations);
+
+            // Deduplicate combinations by keeping the highest value for each weight
+            combinations.sort_by(|a, b| a.2.cmp(&b.2).then_with(|| b.1.cmp(&a.1))); // Sort by weight, then by value
+            combinations.dedup_by(|a, b| a.2 == b.2 && a.1 <= b.1); // Deduplicate by weight, keeping highest value
+        }
+
+        Ok(Some(SubSolution { items }))
+    }
+}
+
+pub fn help() {
+    println!("No help information available.");
+}
diff --git a/tig-algorithms/src/knapsack/mod.rs b/tig-algorithms/src/knapsack/mod.rs
index 33ddf59d..384121e4 100644
--- a/tig-algorithms/src/knapsack/mod.rs
+++ b/tig-algorithms/src/knapsack/mod.rs
@@ -1,4 +1,5 @@
-// c003_a001
+pub mod dynamic;
+pub use dynamic as c003_a001;
 
 // c003_a002