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day 3 in the books; add a template starter

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David
2024-12-03 21:42:55 -05:00
parent 0199cc2d68
commit ac3cf84618
3 changed files with 144 additions and 0 deletions
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128
03/index.ts Normal file
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@@ -0,0 +1,128 @@
import fs from "node:fs";
const data = fs.readFileSync("./inputs/input", "utf8");
console.log(
"part one:",
data
.split("\n")
.slice(0, -1) // remove empty trailing newline
.reduce((total, line) => {
let state = {
char: "",
multiplicand: "",
multiplier: "",
};
for (let index = 0; index < line.length; index++) {
switch (true) {
case "0123456789".includes(line[index]) && state.char === "(":
state.multiplicand += line[index];
break;
case "0123456789".includes(line[index]) && state.char === ",":
state.multiplier += line[index];
break;
case state.char === "(" &&
line[index] === "," &&
state.multiplicand !== "":
state.char = line[index];
break;
case line[index] === ")" &&
state.char === "," &&
state.multiplier !== "":
total +=
parseInt(state.multiplicand, 10) * parseInt(state.multiplier, 10);
state = { char: "", multiplicand: "", multiplier: "" };
break;
case line[index] === "m" && state.char === "":
case line[index] === "u" && state.char === "m":
case line[index] === "l" && state.char === "u":
case line[index] === "(" && state.char === "l":
state.char = line[index];
break;
default:
state = { char: "", multiplicand: "", multiplier: "" };
break;
}
}
return total;
}, 0)
);
console.log(
"part two:",
data
.split("\n")
.slice(0, -1) // remove empty trailing newline
.reduce(
(total, line) => {
let state = {
char: "",
multiplicand: "",
multiplier: "",
on: total.on,
};
for (let index = 0; index < line.length; index++) {
switch (true) {
case "0123456789".includes(line[index]) && state.char === "mul(":
state.multiplicand += line[index];
break;
case "0123456789".includes(line[index]) && state.char === ",":
state.multiplier += line[index];
break;
case state.char === "mul(" &&
line[index] === "," &&
state.multiplicand !== "":
state.char = line[index];
break;
case line[index] === ")" &&
state.char === "," &&
state.multiplier !== "":
if (state.on) {
total = {
...total,
sum: (total.sum +=
parseInt(state.multiplicand, 10) *
parseInt(state.multiplier, 10)),
};
}
state = {
...state,
char: "",
multiplicand: "",
multiplier: "",
};
break;
case line[index] === ")" && state.char === "don't(":
state = { char: "", multiplicand: "", multiplier: "", on: false };
break;
case line[index] === ")" && state.char === "do(":
state = { char: "", multiplicand: "", multiplier: "", on: true };
break;
case line[index] === "m" && state.char === "":
case line[index] === "u" && state.char === "m":
case line[index] === "l" && state.char === "mu":
case line[index] === "(" && state.char === "mul":
case line[index] === "d" && state.char === "":
case line[index] === "o" && state.char === "d":
case line[index] === "n" && state.char === "do":
case line[index] === "(" && state.char === "do":
case line[index] === "'" && state.char === "don":
case line[index] === "t" && state.char === "don'":
case line[index] === "(" && state.char === "don't":
state.char += line[index];
break;
default:
state = {
...state,
char: "",
multiplicand: "",
multiplier: "",
};
break;
}
}
return { ...total, on: state.on };
},
{ sum: 0, on: true }
).sum
);