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day18.js
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day18.js
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const fs = require("fs");
const array = fs.readFileSync("day18.txt", { encoding: "utf-8" }).split("\n");
const oneReduction = (num) => {
const digits = "0123456789";
let count = 0;
for (let i = 0; i < num.length; i++) {
if (num[i] === "]") {
count--;
} else if (num[i] === "[") {
count++;
if (count === 5) {
const left = parseInt(num.slice(i + 1));
const posComma = num.indexOf(",", i);
const right = parseInt(num.slice(posComma + 1));
const posClose = num.indexOf("]", i);
let l = num.slice(0, i);
let r = num.slice(posClose + 1);
for (let j = 0, k = 0; j < r.length; j++) {
if (digits.includes(r[j])) {
for (k = j + 1; k < r.length; k++) {
if (!digits.includes(r[k])) {
break;
}
}
r = `${r.slice(0, j)}${parseInt(r.slice(j)) + right}${r.slice(k)}`;
break;
}
}
for (let j = l.length - 1, k = 0; j >= 0; j--) {
if (digits.includes(l[j])) {
for (k = j - 1; k >= 0; k--) {
if (!digits.includes(l[k])) {
break;
}
}
j++;
k++;
l = `${l.slice(0, k)}${parseInt(l.slice(k)) + left}${l.slice(j)}`;
break;
}
}
num = `${l}0${r}`;
return [num, true];
}
}
}
for (let i = 0; i < num.length; i++) {
if (digits.includes(num[i])) {
let d = parseInt(num.slice(i));
if (d > 9) {
const left = (d - (d % 2)) / 2;
const right = d - left;
for (let j = i + 1; j < num.length; j++) {
if (!digits.includes(num[j])) {
num = `${num.slice(0, i)}[${left},${right}]${num.slice(j)}`;
return [num, true];
}
}
}
}
}
return [num, false];
};
const reducer = (number) => {
let changed;
do {
[number, changed] = oneReduction(number);
} while (changed);
return number;
};
const magnitude = ([l, r]) => {
const lv = Array.isArray(l) ? magnitude(l) : l;
const rv = Array.isArray(r) ? magnitude(r) : r;
return 3 * lv + 2 * rv;
};
const myFunction = (array) => {
const result = array.reduce((a, r) => {
const added = `[${a},${r}]`;
return reducer(added);
});
return magnitude(JSON.parse(result));
};
const value = myFunction(array);
console.log(value);
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++= //
const myFunction2 = (array) => {
let max = 0;
for (let i = 0; i < array.length; i++) {
for (let j = i + 1; j < array.length; j++) {
const v1 = magnitude(JSON.parse(reducer(`[${array[i]},${array[j]}]`)));
const v2 = magnitude(JSON.parse(reducer(`[${array[j]},${array[i]}]`)));
max = max > v1 ? max : v1;
max = max > v2 ? max : v2;
}
}
return max;
};
const value2 = myFunction2(array);
console.log(value2);