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Why System Design Interviews Ask You to Count Billions of Users Without a HashSet

Published 16 Jun 2026 · 32 daily observations recorded · last updated 2026-09-29

Views
112,523
Avg views / hour
44.8
since publish (lifetime average)
Recent velocity
20.0
+481 views over 24h (2026-09-28 → 2026-09-29)
vs channel baseline
—
Channel median
—

Recent growth

Last 7 days
+3,287 views
measured 2026-09-22 → 2026-09-29 (168h)
Last 30 days
+16,912 views
measured 2026-08-27 → 2026-09-29 (792h)

Performance history

Every observation TubeSum recorded, plotted as measured.

Views over time — 32 observed points, 85.4K to 113K views 0 39.4K 78.8K 118K Aug 4, 2026 · 85,410 views Aug 5, 2026 · 85,669 views Aug 7, 2026 · 86,421 views Aug 10, 2026 · 87,325 views Aug 17, 2026 · 90,589 views Aug 18, 2026 · 91,234 views Aug 27, 2026 · 95,611 views Aug 31, 2026 · 98,234 views Sep 1, 2026 · 99,038 views Sep 4, 2026 · 100,896 views Sep 6, 2026 · 101,836 views Sep 7, 2026 · 102,332 views Sep 9, 2026 · 103,543 views Sep 11, 2026 · 104,893 views Sep 12, 2026 · 105,357 views Sep 13, 2026 · 105,730 views Sep 14, 2026 · 106,176 views Sep 15, 2026 · 106,603 views Sep 16, 2026 · 106,961 views Sep 17, 2026 · 107,365 views Sep 18, 2026 · 107,832 views Sep 19, 2026 · 108,171 views Sep 20, 2026 · 108,524 views Sep 21, 2026 · 108,843 views Sep 22, 2026 · 109,236 views Sep 23, 2026 · 109,661 views Sep 24, 2026 · 110,270 views Sep 25, 2026 · 110,690 views Sep 26, 2026 · 111,077 views Sep 27, 2026 · 111,484 views Sep 28, 2026 · 112,042 views Sep 29, 2026 · 112,523 views Aug 4 Sep 13 Sep 29

Based on 32 observations · last observed Sep 29, 2026 · straight lines connect consecutive observations — TubeSum does not measure the days between them.

All observations

The same points the chart plots, as exact numbers. Gaps mean no observation was taken that day.

Date Views Avg views / hour Channel median
2026-09-29 112,523 44.8 —
2026-09-28 112,042 45.1 —
2026-09-27 111,484 45.3 —
2026-09-26 111,077 45.6 —
2026-09-25 110,690 45.8 —
2026-09-24 110,270 46.1 —
2026-09-23 109,661 46.3 —
2026-09-22 109,236 46.6 —
2026-09-21 108,843 46.9 —
2026-09-20 108,524 47.3 —
2026-09-19 108,171 47.7 —
2026-09-18 107,832 48.0 —
2026-09-17 107,365 48.3 —
2026-09-16 106,961 48.7 —
2026-09-15 106,603 49.0 —
2026-09-14 106,176 49.4 —
2026-09-13 105,730 49.7 —
2026-09-12 105,357 50.1 —
2026-09-11 104,893 50.4 —
2026-09-09 103,543 51.0 —
2026-09-07 102,332 51.6 —
2026-09-06 101,836 52.0 —
2026-09-04 100,896 52.7 —
2026-09-01 99,038 53.7 —
2026-08-31 98,234 54.2 —
2026-08-27 95,611 55.6 —
2026-08-18 91,234 60.3 —
2026-08-17 90,589 61.3 —
2026-08-10 87,325 66.7 —
2026-08-07 86,421 69.5 —
2026-08-05 85,669 71.9 —
2026-08-04 85,410 72.7 —

Content analysis

Transcript, chapters and structure for this video live on its analysis page — performance and content are separate documents on TubeSum.

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