init

2023/day1/p2/main.rs

@@ -0,0 +1,112 @@
+use std::fs;
+
+fn find_first(line: &str) -> (u32, usize)
+{
+    let mut value = 0;
+
+    let mut lowest_index = usize::MAX;
+
+    let numbers = vec!["one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
+    let numbers_values = vec![1, 2, 3, 4, 5, 6, 7, 8, 9];
+
+    for i in 0..numbers.len()
+    {
+        let found_index = line.find(numbers[i]);
+        let found_index_value = match found_index {
+            None => continue,
+            Some(found_index) => found_index
+        };
+
+        if found_index_value <= lowest_index
+        {
+            value = numbers_values[i];
+            lowest_index = found_index_value;
+        }
+    }
+
+    return (value, lowest_index);
+}
+
+fn find_last(line: &str) -> (u32, usize)
+{
+    let mut value = 0;
+
+    let mut lowest_index = usize::MIN;
+
+    let numbers = vec!["one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
+    let numbers_values = vec![1, 2, 3, 4, 5, 6, 7, 8, 9];
+
+    for i in 0..numbers.len()
+    {
+        let found_index = line.rfind(numbers[i]);
+        let found_index_value = match found_index {
+            None => continue,
+            Some(found_index) => found_index
+        };
+
+        if found_index_value >= lowest_index
+        {
+            value = numbers_values[i];
+            lowest_index = found_index_value;
+        }
+    }
+
+    return (value, lowest_index);
+}
+
+fn main()
+{
+    let file_path: &str = "./input.text";
+
+    let contents = fs::read_to_string(file_path)
+        .unwrap();
+
+    let mut sum:i32 = 0;
+
+    for line in contents.lines()
+    {
+        println!("{line}");
+
+        let mut first: u32 = 10;
+        let mut first_index: usize = usize::MAX;
+        let mut last: u32 = 0;
+        let mut last_index: usize = usize::MIN;
+
+        let mut index: usize = 0;
+        for character in line.chars()
+        {
+            if character.is_ascii_digit()
+            {
+                let value = character.to_digit(10).unwrap();
+                if first == 10
+                {
+                    first = value;
+                    first_index = index;
+                }
+                last = value;
+                last_index = index;
+            }
+            index += 1;
+        }
+
+        let (l_value, l_index) = find_last(line);
+        if l_index > last_index
+        {
+            last = l_value;
+        }
+        let (f_value, f_index) = find_first(line);
+        if f_index < first_index
+        {
+            first = f_value;
+        }
+
+        let result = first.to_string() + &last.to_string();
+
+        println!("Sum of line {result}.");
+
+        sum += result.parse::<i32>().unwrap();
+
+    }
+
+    println!("Sum: {sum}");
+}