# How do I find a maximum number of consecutive non-zero values in the array?

**URL:** <https://discourse.processing.org/t/how-do-i-find-a-maximum-number-of-consecutive-non-zero-values-in-the-array/29200>\
**Category:** Coding Questions\
**Tags:** homework\
**Created:** [April 7, 2021, 9:23pm UTC](https://discourse.processing.org/t/how-do-i-find-a-maximum-number-of-consecutive-non-zero-values-in-the-array/29200 "2021-04-07T21:23:46Z")\
**Posts on this page:** 1\
**Page:** 2

<div class="post-metadata">

**Author:** ![GoToLoop](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/gotoloop/32/86_2.png) [@GoToLoop](https://discourse.processing.org/u/GoToLoop)\
**Post date:** [April 9, 2021, 1:00am UTC](https://discourse.processing.org/t/how-do-i-find-a-maximum-number-of-consecutive-non-zero-values-in-the-array/29200/21 "2021-04-09T01:00:10Z")

</div>

For completeness’ sake I’m also posting Python Mode & p5.js flavors of my original Java Mode version:

```auto
"""
 * Max Number of Consecutive Non-Zero Values (v1.0.1)
 * GoToLoop (2021/Apr/08)
 *
 * https://Discourse.Processing.org/t/
 * how-do-i-find-a-maximum-number-of-
 * consecutive-non-zero-values-in-the-array/29200/21
"""

vals = (
    0, # 0
    MAX_INT, MIN_INT, 0, # 2
    -1, 3, 40, 100, 0, # 4
    5 # 1
    )

def setup():
    print vals
    print maxSeqNonZero(vals) # 4
    exit()

def maxSeqNonZero(lst):
    if not lst: return 0

    seqCount = maxCount = 0

    for n in lst:
        seqCount += 1 if n else -seqCount
        maxCount = max(maxCount, seqCount)

    return maxCount

```

```auto
/**
 * Max Number of Consecutive Non-Zero Values (v1.0.1)
 * GoToLoop (2021/Apr/08)
 *
 * https://Discourse.Processing.org/t/
 * how-do-i-find-a-maximum-number-of-
 * consecutive-non-zero-values-in-the-array/29200/21
 */

const
  MAX_INT = 2 ** 31 - 1,
  MIN_INT = 2 ** 31 | 0,

  vals = Int32Array.of(
    0, // 0
    MAX_INT, MIN_INT, 0, // 2
    -1, 3, 40, 100, 0, // 4
    5 // 1
  );

function setup() {
  noCanvas();
  console.table(vals);
  print(maxSeqNonZero(vals)); // 4
}

function maxSeqNonZero(arr) {
  if (!arr || !arr.length) return 0;

  var seqCount = 0, maxCount = 0;

  for (const n of arr)
    maxCount = max(maxCount, seqCount += n? 1 : -seqCount);

  return maxCount;
}

```

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