AlgoDaily Solution

1var assert = require('assert');
2
3function subarraySum(nums, n) {
4  let sumsMap = { 0: 1 }; // hash of prefix sums
5  let sum = 0;
6  for (let num of nums) {
7    sum += num; // increment current sum
8    if (sumsMap[sum - n]) {
9      return true;
10    }
11    // store sum so far in hash with truthy value
12    sumsMap[sum] = true;
13  }
14  return false;
15}
16
17const arr = [1, 2, 3],
18  sum = 5;
19console.log(subarraySum(arr, sum));
20
21try {
22  assert.equal(subarraySum([1, 2, 3], 3), true);
23
24  console.log('PASSED: ' + 'assert.equal(subarraySum([ 1, 2, 3 ], 3), true)');
25} catch (err) {
26  console.log(err);
27}
28
29try {
30  assert.equal(subarraySum([], 3), false);
31
32  console.log('PASSED: ' + 'assert.equal(subarraySum([], 3), false)');
33} catch (err) {
34  console.log(err);
35}
36
37try {
38  assert.equal(subarraySum([3, 6, 12, 35], 47), true);
39
40  console.log(
41    'PASSED: ' + 'assert.equal(subarraySum([3, 6, 12, 35], 47), true)'
42  );
43} catch (err) {
44  console.log(err);
45}

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