diff --git a/2024/10/example.txt b/2024/10/example.txt
new file mode 100644
index 0000000..cada9b3
--- /dev/null
+++ b/2024/10/example.txt
@@ -0,0 +1,8 @@
+89010123
+78121874
+87430965
+96549874
+45678903
+32019012
+01329801
+10456732
diff --git a/2024/10/input.txt b/2024/10/input.txt
new file mode 100644
index 0000000..452a4bc
--- /dev/null
+++ b/2024/10/input.txt
@@ -0,0 +1,58 @@
+5678970120787667809876787651450321789810165432234561012345
+4301787431296556912765698540341410786728765501103676545434
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diff --git a/2024/10/solution.js b/2024/10/solution.js
new file mode 100644
index 0000000..afaca02
--- /dev/null
+++ b/2024/10/solution.js
@@ -0,0 +1,55 @@
+
+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)
+