From 8bad410a3aa77edb0a8f6460251fd4ff8d79a55c Mon Sep 17 00:00:00 2001
From: Meisterlala <6453306+Meisterlala@users.noreply.github.com>
Date: Mon, 18 Apr 2022 17:10:58 +0200
Subject: [PATCH] Knapsack

---
 .../Part 3/knapsack/Cargo.lock                |    7 +
 .../Part 3/knapsack/Cargo.toml                |    8 +
 .../knapsack/input_random_17_100_1000.txt     | 1001 +++++++++
 .../knapsack/input_random_26_1000_1000.txt    | 1001 +++++++++
 .../Part 3/knapsack/input_random_5_10_10.txt  |   11 +
 .../Part 3/knapsack/knapsack1.txt             |  101 +
 .../Part 3/knapsack/knapsack_big.txt          | 2001 +++++++++++++++++
 .../Part 3/knapsack/src/lib.rs                |   61 +
 .../Part 3/knapsack/src/main.rs               |   50 +
 9 files changed, 4241 insertions(+)
 create mode 100644 Algorithms Specialization/Part 3/knapsack/Cargo.lock
 create mode 100644 Algorithms Specialization/Part 3/knapsack/Cargo.toml
 create mode 100644 Algorithms Specialization/Part 3/knapsack/input_random_17_100_1000.txt
 create mode 100644 Algorithms Specialization/Part 3/knapsack/input_random_26_1000_1000.txt
 create mode 100644 Algorithms Specialization/Part 3/knapsack/input_random_5_10_10.txt
 create mode 100644 Algorithms Specialization/Part 3/knapsack/knapsack1.txt
 create mode 100644 Algorithms Specialization/Part 3/knapsack/knapsack_big.txt
 create mode 100644 Algorithms Specialization/Part 3/knapsack/src/lib.rs
 create mode 100644 Algorithms Specialization/Part 3/knapsack/src/main.rs

diff --git a/Algorithms Specialization/Part 3/knapsack/Cargo.lock b/Algorithms Specialization/Part 3/knapsack/Cargo.lock
new file mode 100644
index 0000000..e5b936e
--- /dev/null
+++ b/Algorithms Specialization/Part 3/knapsack/Cargo.lock	
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "knapsack"
+version = "0.1.0"
diff --git a/Algorithms Specialization/Part 3/knapsack/Cargo.toml b/Algorithms Specialization/Part 3/knapsack/Cargo.toml
new file mode 100644
index 0000000..7b1d5d9
--- /dev/null
+++ b/Algorithms Specialization/Part 3/knapsack/Cargo.toml	
@@ -0,0 +1,8 @@
+[package]
+name = "knapsack"
+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/Algorithms Specialization/Part 3/knapsack/input_random_17_100_1000.txt b/Algorithms Specialization/Part 3/knapsack/input_random_17_100_1000.txt
new file mode 100644
index 0000000..7f76123
--- /dev/null
+++ b/Algorithms Specialization/Part 3/knapsack/input_random_17_100_1000.txt	
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diff --git a/Algorithms Specialization/Part 3/knapsack/input_random_26_1000_1000.txt b/Algorithms Specialization/Part 3/knapsack/input_random_26_1000_1000.txt
new file mode 100644
index 0000000..d4a1ea4
--- /dev/null
+++ b/Algorithms Specialization/Part 3/knapsack/input_random_26_1000_1000.txt	
@@ -0,0 +1,1001 @@
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diff --git a/Algorithms Specialization/Part 3/knapsack/input_random_5_10_10.txt b/Algorithms Specialization/Part 3/knapsack/input_random_5_10_10.txt
new file mode 100644
index 0000000..2f37742
--- /dev/null
+++ b/Algorithms Specialization/Part 3/knapsack/input_random_5_10_10.txt	
@@ -0,0 +1,11 @@
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diff --git a/Algorithms Specialization/Part 3/knapsack/knapsack1.txt b/Algorithms Specialization/Part 3/knapsack/knapsack1.txt
new file mode 100644
index 0000000..0e9ccca
--- /dev/null
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diff --git a/Algorithms Specialization/Part 3/knapsack/knapsack_big.txt b/Algorithms Specialization/Part 3/knapsack/knapsack_big.txt
new file mode 100644
index 0000000..20cce77
--- /dev/null
+++ b/Algorithms Specialization/Part 3/knapsack/knapsack_big.txt	
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diff --git a/Algorithms Specialization/Part 3/knapsack/src/lib.rs b/Algorithms Specialization/Part 3/knapsack/src/lib.rs
new file mode 100644
index 0000000..7c3cb17
--- /dev/null
+++ b/Algorithms Specialization/Part 3/knapsack/src/lib.rs	
@@ -0,0 +1,61 @@
+pub struct Knapsack {
+    size: usize,
+
+    items: Vec<Item>,
+}
+
+struct Item {
+    value: u32,
+    weight: u32,
+}
+
+pub type KnapsackSolution = Vec<Vec<u32>>;
+
+pub fn knapsack(problem: &Knapsack) -> KnapsackSolution {
+    let item_count = problem.items.len();
+    let mut solution = vec![vec![0; problem.size + 1]; item_count + 1];
+
+    for i in 0..item_count + 1 {
+        for j in 0..problem.size + 1 {
+            if i == 0 || j == 0 {
+                solution[i][j] = 0;
+            } else if problem.items[i - 1].weight as usize <= j {
+                solution[i][j] = std::cmp::max(
+                    problem.items[i - 1].value
+                        + solution[i - 1][j - problem.items[i - 1].weight as usize],
+                    solution[i - 1][j],
+                );
+            } else {
+                solution[i][j] = solution[i - 1][j];
+            }
+        }
+    }
+
+    solution
+}
+
+pub fn read_file(path: &str) -> Knapsack {
+    let mut file = std::fs::File::open(path).expect("file not found");
+    let mut contents = String::new();
+    std::io::Read::read_to_string(&mut file, &mut contents)
+        .expect("something went wrong reading the file");
+
+    let mut lines = contents.lines();
+    let mut first_line = lines.next().unwrap().split_whitespace();
+    let size = first_line.next().unwrap().parse::<usize>().unwrap();
+    let item_count = first_line.next().unwrap().parse::<usize>().unwrap();
+    let mut items = Vec::with_capacity(item_count);
+
+    for line in lines {
+        let mut parts = line.split_whitespace();
+        let value = parts.next().unwrap().parse::<u32>().unwrap();
+        let weight = parts.next().unwrap().parse::<u32>().unwrap();
+        items.push(Item { value, weight });
+    }
+
+    Knapsack { size, items }
+}
+
+pub fn optimal_solution(solution: &KnapsackSolution) -> usize {
+    *solution.last().unwrap().last().unwrap() as usize
+}
diff --git a/Algorithms Specialization/Part 3/knapsack/src/main.rs b/Algorithms Specialization/Part 3/knapsack/src/main.rs
new file mode 100644
index 0000000..f3808f2
--- /dev/null
+++ b/Algorithms Specialization/Part 3/knapsack/src/main.rs	
@@ -0,0 +1,50 @@
+use knapsack::*;
+
+fn main() {
+    println!("Knapsack problem solution for: knapsack1.txt");
+    println!("Reading File...");
+    let problem = read_file("knapsack1.txt");
+    println!("Solving...");
+    let solution = knapsack(&problem);
+    println!("Optimal solution: {}", optimal_solution(&solution));
+
+    println!("Knapsack problem solution for: knapsack_big.txt");
+    println!("Reading File...");
+    let problem = read_file("knapsack_big.txt");
+    println!("Solving...");
+    let solution = knapsack(&problem);
+    println!("Optimal solution: {}", optimal_solution(&solution));
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_file() {
+        read_file("knapsack1.txt");
+    }
+
+    fn test_complete(path: &str, expected: usize) {
+        let data = read_file(path);
+        let solution = knapsack(&data);
+        let solution2 = knapsack_slick(&data);
+        assert_eq!(optimal_solution(&solution), expected);
+        assert_eq!(optimal_solution(&solution2), expected);
+    }
+
+    #[test]
+    fn input_random_5() {
+        test_complete("input_random_5_10_10.txt", 14);
+    }
+
+    #[test]
+    fn input_random_17() {
+        test_complete("input_random_17_100_1000.txt", 1993);
+    }
+
+    #[test]
+    fn input_random_26() {
+        test_complete("input_random_26_1000_1000.txt", 18669);
+    }
+}
-- 
2.51.2