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compare: tristan:314c6215f355387e39c9dab027e67b110857f537
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4 changed files with 0 additions and 176 deletions
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8
2024/10/example.txt
View file

@ -1,8 +0,0 @@
89010123
78121874
87430965
96549874
45678903
32019012
01329801
10456732

58
2024/10/input.txt
View file

@ -1,58 +0,0 @@
5678970120787667809876787651450321789810165432234561012345
4301787431296556912765698540341410786728765501103676545434
3212896594365443213454501231232545695439154610898387656946
4307885785872337801653215432545694321089043781763296047877
5456934576901236998740126721694787899676112891054102137898
4327825676210365485035432830780146788765208982567873223703
1012010789301345304126701910567235623654367643432984012612
9887652105401253213239878323458945514545106543221265698543
6798943766798760560145569850179876408763215456100896787432
5212237854899621056776457763287654309854580367018701656501
4302108983014552345889308954390101218345691278929632540987
8921321212123467496973217654321010101210782987834541231236
7010450908765658787210106563898110567623458906543210340145
6524567849434349872323293478967223408988967217890107459054
5433008956721238721494782566554310510177654394345498768765
8942112349810101430585691057431214321287656783216321659056
9853523658901233549674541008120109450392345654307010123141
6765434567890312678234432219078218765431874309458927034230
1034323450765403510165498348569341016210967218567898985541
4125614321877654523276327653414452547893458967898769876632
3210701234988347678987014512103963458982105450745601896781
4678890215679298689898101105432878967821123301234312765890
5469810309100198776543239416001263456710054210126543454323
6954323458210789743987678327122452349821269329237632670110
7856542167345679812310565498214301265430178778748911789224
3067630018901256701423457012303210178923476565652100654343
2188921078872345690501298989452121089012383418983434334534
3298934569863418987632367898763011298234592307894521025676
0387650101678507876753456501014980347105681016765601210787
1456343212589216909865401432325671256501789823454782309898
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3218765478710123378765645612107845435434345212345621678101

55
2024/10/solution.js
View file

@ -1,55 +0,0 @@
const input = (await Bun.file("input.txt").text()).trim()
const rows = [[]];
const trailheads = [];
for (let i = 0, x = 0, y = 0; i < input.length; i++) {
if (input[i] == "\n") {
rows.push([]);
y++;
x = 0;
continue;
}
const alt = parseInt(input[i]);
rows[y].push(alt);
if (alt == 0) {
trailheads.push({x,y})
}
x++;
}
const summitChart = Array.from({length: rows.length}, () => Array.from({length: rows.length}, () => (new Set())))
function findSummits({x, y}) {
if (summitChart[y][x].size > 0) {
return summitChart[y][x]
}
if (rows[y][x] == 9) {
summitChart[y][x].add(x + y * rows.length)
return summitChart[y][x]
}
if (x != 0 && rows[y][x-1] - rows[y][x] == 1) {
summitChart[y][x] = summitChart[y][x].union(findSummits({y, x: x - 1}))
}
if (x != rows.length - 1 && rows[y][x+1] - rows[y][x] == 1) {
summitChart[y][x] = summitChart[y][x].union(findSummits({y, x: x + 1}))
}
if (y != 0 && rows[y-1][x] - rows[y][x] == 1) {
summitChart[y][x] = summitChart[y][x].union(findSummits({y: y-1, x}))
}
if (y != rows.length - 1 && rows[y+1][x] - rows[y][x] == 1) {
summitChart[y][x] = summitChart[y][x].union(findSummits({y: y+1, x}))
}
return summitChart[y][x]
}
let sum = 0;
for (const trailhead of trailheads) {
const summits = findSummits(trailhead)
sum += summits.size
}
console.log(sum)

55
2024/10/solution2.js
View file

@ -1,55 +0,0 @@
const input = (await Bun.file("input.txt").text()).trim()
const rows = [[]];
const trailheads = [];
for (let i = 0, x = 0, y = 0; i < input.length; i++) {
if (input[i] == "\n") {
rows.push([]);
y++;
x = 0;
continue;
}
const alt = parseInt(input[i]);
rows[y].push(alt);
if (alt == 0) {
trailheads.push({x,y})
}
x++;
}
const summitChart = Array.from({length: rows.length}, () => Array.from({length: rows.length}, () => ([])))
function findSummits({x, y}) {
if (summitChart[y][x].length > 0) {
return summitChart[y][x]
}
if (rows[y][x] == 9) {
summitChart[y][x].push(x + y * rows.length)
return summitChart[y][x]
}
if (x != 0 && rows[y][x-1] - rows[y][x] == 1) {
summitChart[y][x].push(...findSummits({y, x: x - 1}))
}
if (x != rows.length - 1 && rows[y][x+1] - rows[y][x] == 1) {
summitChart[y][x].push(...findSummits({y, x: x + 1}))
}
if (y != 0 && rows[y-1][x] - rows[y][x] == 1) {
summitChart[y][x].push(...findSummits({y: y-1, x}))
}
if (y != rows.length - 1 && rows[y+1][x] - rows[y][x] == 1) {
summitChart[y][x].push(...findSummits({y: y+1, x}))
}
return summitChart[y][x]
}
let sum = 0;
for (const trailhead of trailheads) {
const summits = findSummits(trailhead)
sum += summits.length
}
console.log(sum)