Day 6 part 1

day6/day6-ts.ts

@@ -0,0 +1,54 @@
+type Race = {
+  time: number;
+  distance: number;
+};
+const races: Race[] = [];
+
+const input = `Time:        47     70     75     66
+Distance:   282   1079   1147   1062`.split("\n");
+
+// parse input
+const [t, ...rtimes] = input[0].split(" ");
+const times = rtimes.filter((o) => o !== "").map((o) => Number(o));
+const [d, ...rdist] = input[1].split(" ");
+const dist = rdist.filter((o) => o !== "").map((o) => Number(o));
+
+for (let i = 0; i < times.length; i++) {
+  races.push({ time: times[i], distance: dist[i] });
+}
+console.log(races);
+
+function getSpeed(race: Race, holdTime: number): number {
+  return (race.time - holdTime) * holdTime;
+}
+
+let mul = 1;
+const counts: number[] = [];
+
+for (const race of races) {
+  let from = 1;
+  let to = 1;
+  for (let i = 0; i < race.time; i++) {
+    if (getSpeed(race, i) > race.distance) {
+      from = i;
+      break;
+    }
+  }
+  for (let i = race.time; i >= 0; i--) {
+    if (getSpeed(race, i) > race.distance) {
+      to = i;
+      break;
+    }
+  }
+  counts.push(to - from + 1);
+
+}
+for (const count of counts) {
+  mul *= count;
+}
+console.log(mul);
+
+// console.log(getSpeed(races[0], 2));
+// console.log(getSpeed(races[0], 3));
+// console.log(getSpeed(races[0], 4));
+// console.log(getSpeed(races[0], 5));