Day 10 part 1

10/input

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+74
+153
+60
+163
+112
+151
+22
+67
+43
+160
+193
+6
+2
+16
+122
+126
+32
+181
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+12
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+161
+33
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+31
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+148
+104
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+38
+133
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+3
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+48
+80
+179
+92
+194
+86
+40
+13
+123
+68
+115
+19
+46
+77
+152
+138
+69
+49
+59
+30
+132
+9
+185
+1
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+171
+72
+116
+101
+61
+141
+107
+21
+47
+147
+182
+170
+39
+37
+127
+26
+102
+137
+191
+162
+172
+29
+10
+154
+157
+83
+82
+175
+145
+167

10/part1.js

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+const fs = require('fs');
+
+fs.readFile('input', (err, data) => {
+  if (err) throw err;
+  let input = data.toString().trim().split("\n").map((line) => Number(line) );
+
+  let builtIn = Math.max(...input) + 3;
+  let adapters = new Set ( input );
+  let jolts = 0;
+  let diff1s = 0;
+  let diff3s = 1; // The built-ion adapter
+
+  for (i=0; i < input.length; i++) {
+      // All entries are unique, so no need to worry about jolts+0
+    if (adapters.has(jolts+1)) {
+      diff1s++;
+      adapters.delete(jolts+1);
+      jolts++;
+    } else if (adapters.has(jolts+2)) {
+      adapters.delete(jolts+2);
+      jolts+=2;
+    } else if (adapters.has(jolts+3)) {
+      diff3s++;
+      adapters.delete(jolts+3);
+      jolts+=3;
+    } else {
+      throw ("oh no");
+    }
+  };
+
+  console.log(diff1s * diff3s);
+});