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new file mode 100644
index 0000000..409c9e1
--- /dev/null
+++ b/day3/.gitignore
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diff --git a/day3/input b/day3/input
new file mode 100644
index 0000000..f17e726
--- /dev/null
+++ b/day3/input
@@ -0,0 +1,6 @@
+vJrwpWtwJgWrhcsFMMfFFhFp
+jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
+PmmdzqPrVvPwwTWBwg
+wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw
diff --git a/day3/package.json b/day3/package.json
new file mode 100644
index 0000000..29c5523
--- /dev/null
+++ b/day3/package.json
@@ -0,0 +1,5 @@
+{
+  "devDependencies": {
+    "@types/node": "^18.11.10"
+  }
+}
diff --git a/day3/solution.ts b/day3/solution.ts
new file mode 100644
index 0000000..897c8eb
--- /dev/null
+++ b/day3/solution.ts
@@ -0,0 +1,73 @@
+import { readFileSync } from 'fs';
+import { join } from 'path';
+
+function findNDupes(inputArrays): string {
+  var countMap = {};
+  for (const inputArray of inputArrays) {
+    const s = new Set<string>(inputArray);
+    s.forEach(function(val){
+        if (val in countMap) {
+          countMap[val] += 1;
+        } else {
+          countMap[val] = 1;
+        }
+    });
+  }
+
+  for (const key in countMap) {
+    if (countMap[key] == inputArrays.length) {
+      return key;
+    }
+  }
+}
+
+const fileString = readFileSync(join(__dirname, "inp"), 'utf-8');
+const rucksacks = fileString.split("\n");
+
+var sum: number = 0;
+
+for (const rucksack of rucksacks) {
+  if (rucksack.length == 0) {
+    continue;
+  }
+  const items = rucksack.split('');
+  const firstHalf = items.slice(0, items.length/2);
+  const secondHalf = items.slice(items.length/2, items.length);
+  const ndup = findNDupes([firstHalf, secondHalf])
+
+  const s = new Set<string>(ndup);
+  s.forEach(function(val){
+    const charNum = val.charCodeAt(0);
+    if (charNum > 96) {
+      sum += charNum - 96;
+    } else {
+      sum += charNum - 38;
+    }
+  });
+}
+
+console.log(sum);
+
+
+sum = 0;
+
+for (var i = 0; i < rucksacks.length; i += 3) {
+  if (i + 1 >= rucksacks.length) {
+    continue;
+  }
+  const r1 = rucksacks[i].split('');
+  const r2 = rucksacks[i+1].split('');
+  const r3 = rucksacks[i+2].split('');
+  
+  const ndup = findNDupes([r1, r2, r3])
+  const s = new Set<string>(ndup);
+  s.forEach(function(val){
+    const charNum = val.charCodeAt(0);
+    if (charNum > 96) {
+      sum += charNum - 96;
+    } else {
+      sum += charNum - 38;
+    }
+  });
+}
+console.log(sum);
diff --git a/day3/tsconfig.json b/day3/tsconfig.json
new file mode 100644
index 0000000..80c821c
--- /dev/null
+++ b/day3/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "types": [
+      "node"
+    ]
+  }
+}