Day 3

2025/3/deadvey/Cargo.toml

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+[package]
+name = "deadvey"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

2025/3/deadvey/src/main.rs

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+use std::fs;
+use std::time::Instant;
+
+fn algorithm(banks: &Vec<&str>) -> (u64, u64)
+{
+    let bank_length = banks[0].len();
+    let mut total1: u64 = 0;
+    let mut total2: u64 = 0;
+    for bank in banks {
+        let mut prev_index = 0;
+        let mut joltages: [u64; 12] = [0; 12];
+        let mut highest: u64 = 0;
+        let mut overall_index = 0;
+        for i in 0..=11 {
+            for joltage in bank[prev_index..(bank_length-(11-i))].bytes() {
+                overall_index += 1;
+                if joltage == 57 {
+                    highest = 9;
+                    prev_index = overall_index;
+                    break;
+                }
+                let joltage_int = joltage ^ 48; // ASCII mask using XOR (^)
+                if joltage_int as u64 > highest {
+                    prev_index = overall_index;
+                    highest = joltage_int as u64;
+                }
+            }
+            overall_index = prev_index;
+            joltages[i] = highest as u64;
+            highest = 0;
+        }
+        prev_index = 0;
+        for i in 0..=10 {
+            if joltages[i] > highest.into() {
+                highest = joltages[i] as u64;
+                prev_index = i+1;
+            }
+        }
+        total1 += (highest * 10) as u64;
+        highest = 0;
+        for i in prev_index..=11 {
+            if joltages[i] > highest.into() {
+                highest = joltages[i] as u64;
+            }
+        }
+        total1 += (highest) as u64;
+        total2 += joltages[0] * 10_u64.pow(11)
+            + joltages[1] * 10_u64.pow(10)
+            + joltages[2] * 10_u64.pow(9)
+            + joltages[3] * 10_u64.pow(8)
+            + joltages[4] * 10_u64.pow(7)
+            + joltages[5] * 10_u64.pow(6)
+            + joltages[6] * 10_u64.pow(5)
+            + joltages[7] * 10_u64.pow(4)
+            + joltages[8] * 10_u64.pow(3)
+            + joltages[9] * 10_u64.pow(2)
+            + joltages[10] * 10_u64
+            + joltages[11];
+    }
+
+    (total1, total2)
+}
+
+// 987654321111111 = 1 bank
+// 811111111111119
+// 234234234234278
+// 818181911112111
+fn main() {
+    let start = Instant::now();
+    let file_contents: String = fs::read_to_string("../large.txt").unwrap();
+    let mut banks: Vec<&str> = file_contents
+        .split('\n')
+        .collect::<Vec<&str>>();
+    banks.pop();
+    let file_read = start.elapsed();
+
+    let (total1, total2) = algorithm(&banks);
+    let end = start.elapsed();
+
+    let end = start.elapsed();
+    println!("part1: {total1}");
+    println!("part2: {total2}");
+    println!("Times:
+    File read:          {:.2?}
+    Loop:               {:.2?}
+    Avg time per pair:  {:.2?}
+    Total:              {:.4?}
+    ",
+    file_read,
+    end-file_read,
+    (end-file_read)/(10000).try_into().unwrap(),
+    end);
+}