Day 01 and 02 2019.

2019/02/src/main.rs

@@ -0,0 +1,106 @@
+use std::env;
+use std::fs;
+
+fn main() {
+    let input = env::args().nth(1).expect("need an input file");
+
+    let data = fs::read_to_string(&input).expect("failed to read input file");
+
+    let intcode = data
+        .split(',')
+        .map(|value| {
+            value
+                .trim()
+                .parse::<usize>()
+                .expect("failed to convert value to u8")
+        })
+        .collect::<Vec<_>>();
+
+    let mut program = intcode.clone();
+
+    program[1] = 12;
+    program[2] = 2;
+
+    let mut pc = 0;
+
+    loop {
+        match program[pc] {
+            1 => {
+                let a_addr = program[pc + 1];
+                let b_addr = program[pc + 2];
+                let x_addr = program[pc + 3];
+
+                program[x_addr] = program[a_addr] + program[b_addr];
+                pc += 4;
+            }
+            2 => {
+                let a_addr = program[pc + 1];
+                let b_addr = program[pc + 2];
+                let x_addr = program[pc + 3];
+
+                program[x_addr] = program[a_addr] * program[b_addr];
+                pc += 4;
+            }
+            99 => {
+                break;
+            }
+            _ => panic!("invalid op code"),
+        }
+    }
+
+    println!("part_one={}", program[0]);
+
+    let mut noun = 0;
+    let mut verb = 0;
+
+    loop {
+        let mut program = intcode.clone();
+
+        program[1] = noun;
+        program[2] = verb;
+
+        let mut pc = 0;
+
+        loop {
+            match program[pc] {
+                1 => {
+                    let a_addr = program[pc + 1];
+                    let b_addr = program[pc + 2];
+                    let x_addr = program[pc + 3];
+
+                    program[x_addr] = program[a_addr] + program[b_addr];
+                    pc += 4;
+                }
+                2 => {
+                    let a_addr = program[pc + 1];
+                    let b_addr = program[pc + 2];
+                    let x_addr = program[pc + 3];
+
+                    program[x_addr] = program[a_addr] * program[b_addr];
+                    pc += 4;
+                }
+                99 => {
+                    break;
+                }
+                _ => panic!("invalid op code"),
+            }
+        }
+
+        if program[0] == 19690720 {
+            break;
+        }
+
+        noun += 1;
+
+        if noun > 99 {
+            noun = 0;
+            verb += 1;
+
+            if verb > 99 {
+                panic!("failed to find a valid input pair");
+            }
+        }
+    }
+
+    println!("part_two={}", 100 * noun + verb);
+}