aoc2019-2.js

const input = [1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,9,1,19,1,9,19,23,1,23,5,27,2,27,10,31,1,6,31,35,1,6,35,39,2,9,39,43,1,6,43,47,1,47,5,51,1,51,13,55,1,55,13,59,1,59,5,63,2,63,6,67,1,5,67,71,1,71,13,75,1,10,75,79,2,79,6,83,2,9,83,87,1,5,87,91,1,91,5,95,2,9,95,99,1,6,99,103,1,9,103,107,2,9,107,111,1,111,6,115,2,9,115,119,1,119,6,123,1,123,9,127,2,127,13,131,1,131,9,135,1,10,135,139,2,139,10,143,1,143,5,147,2,147,6,151,1,151,5,155,1,2,155,159,1,6,159,0,99,2,0,14,0];

const a = [...input];
a[1] = 12;
a[2] = 2;

let i = 0;
do {
    if (a[i] === 1) a[a[i + 3]] = a[a[i + 1]] + a[a[i + 2]];
    else if (a[i] === 2) a[a[i + 3]] = a[a[i + 1]] * a[a[i + 2]];
    else if (a[i] === 99) break;
    i += 4;
} while (true);
console.log(a[0]);

let noun, verb;
out: for (let n = 0; n < 100; n++) {
    for (let v = 0; v < 100; v++) {
        const b = [...input];
        b[1] = n;
        b[2] = v;
        let j = 0;
        do {
            if (b[j] === 1) b[b[j + 3]] = b[b[j + 1]] + b[b[j + 2]];
            else if (b[j] === 2) b[b[j + 3]] = b[b[j + 1]] * b[b[j + 2]];
            else if (b[j] === 99) break;
            j += 4;
        } while (true);
        if (b[0] === 19690720) {
            noun = n;
            verb = v;
            break out;
        }
    }
}
console.log(100 * noun + verb);