Wrote program for Day 38

README.md

@@ -84,7 +84,7 @@ We encourage you to share your progress and ask questions in the Discussions sec
 | Day #35       | [Dog And Gopher](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-05/Day-35_Dog-And-Gopher)                        | :white_check_mark:      |
 | Day #36       | [LCD Display](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-06/Day-36_LCD-Display)                           | :white_check_mark:      |
 | Day #37       | [Breaking The Records](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-06/Day-37_Breaking-The-Records)                  | :white_check_mark:      |
-| Day #38       | [Electronics Shop](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-06/Day-38_Electronics-Shop)                      | :white_large_square:      |
+| Day #38       | [Electronics Shop](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-06/Day-38_Electronics-Shop)                      | :white_check_mark:      |
 | Day #39       | [Halloween Sale](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-06/Day-39_Halloween-Sale)                        | :white_large_square:      |
 | Day #40       | [Larrys Array](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-06/Day-40_Larrys-Array)                          | :white_large_square:      |
 | Day #41       | [Sales By Match](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-06/Day-41_Sales-By-Match)                        | :white_large_square:      |

Week-06/Day-38_Electronics-Shop/day38/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "day38"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

Week-06/Day-38_Electronics-Shop/day38/src/lib.rs

@@ -0,0 +1,44 @@
+pub fn get_money_spent(
+    keyboards: &[usize],
+    mut drives: Vec<usize>,
+    budget: usize,
+) -> Option<usize> {
+    let mut result = None;
+    drives.sort();
+
+    for k in keyboards {
+        match floor(&drives, budget - k) {
+            Some(d) => {
+                if result.is_none() || Some(k + d) > result {
+                    result = Some(k + d)
+                }
+            }
+            None => continue,
+        }
+    }
+
+    result
+}
+
+fn floor(array: &[usize], element: usize) -> Option<usize> {
+    let mut start = 0;
+    let mut end = array.len() - 1;
+
+    while start <= end {
+        println!("start: {start}, end: {end}");
+        let mid = (start + end) / 2;
+        match array[mid].cmp(&element) {
+            std::cmp::Ordering::Equal => return Some(element),
+            std::cmp::Ordering::Less => start = mid + 1,
+            std::cmp::Ordering::Greater => {
+                if mid > 0 {
+                    end = mid - 1
+                } else {
+                    return None;
+                }
+            }
+        }
+    }
+
+    Some(array[start - 1])
+}

Week-06/Day-38_Electronics-Shop/day38/src/main.rs

@@ -0,0 +1,67 @@
+use std::{
+    io::{self, Write},
+    num::ParseIntError,
+    process::exit,
+};
+
+use day38::get_money_spent;
+
+fn get_string(request: &str) -> String {
+    print!("{request}");
+    io::stdout().flush().expect("Failed to flush stdout");
+
+    let mut buffer = String::new();
+
+    io::stdin()
+        .read_line(&mut buffer)
+        .expect("Failed to read line");
+    buffer
+}
+
+fn get_usize_vec(request: &str) -> Result<Vec<usize>, String> {
+    let buffer = get_string(request);
+    Ok(buffer
+        .split_whitespace()
+        .try_fold(Vec::new(), |mut acc, x| match x.parse::<usize>() {
+            Ok(n) => {
+                acc.push(n);
+                Ok(acc)
+            }
+            Err(_) => Err("Prices must be valid integers".to_string()),
+        })
+        .unwrap_or(Vec::new()))
+}
+
+fn get_usize(request: &str) -> Result<usize, ParseIntError> {
+    let buffer = get_string(request);
+    buffer.parse()
+}
+
+fn main() {
+    let keyboards = match get_usize_vec("Insert the price of the keyboards space separated: ") {
+        Ok(x) => x,
+        Err(e) => {
+            eprintln!("{e}");
+            exit(1);
+        }
+    };
+    let drives = match get_usize_vec("Insert the price of the drivers space separated: ") {
+        Ok(x) => x,
+        Err(e) => {
+            eprintln!("{e}");
+            exit(1);
+        }
+    };
+    let budget = match get_usize("Insert the budget: ") {
+        Ok(x) => x,
+        Err(e) => {
+            eprintln!("{}", e);
+            exit(1);
+        }
+    };
+    let result = get_money_spent(&keyboards, drives, budget);
+    match result {
+        Some(x) => println!("The maximum that can be spent is {x}."),
+        None => println!("It is not possible to buy both items."),
+    }
+}

Week-06/Day-38_Electronics-Shop/day38/tests/example.rs

@@ -0,0 +1,9 @@
+#[cfg(test)]
+mod example {
+    use day38::get_money_spent;
+
+    #[test]
+    fn test() {
+        assert_eq!(get_money_spent(&[40, 50, 60], vec![5, 8, 12], 60), Some(58));
+    }
+}