Bitcoin price on September 12, 2026: BTC closed at $77,263, up 0.07%, in a $445 range between a $77,495 high and a $77,050 low — the fourth-narrowest session of 2026 and, on volume of 1,669 BTC, barely a quarter of the twenty-day average, the quietest aftermath imaginable to Friday’s $3,822 inflation-day round trip, with the Federal Reserve’s decision now four sessions away. The snapshot and charts are first, the short version follows, and the full explanations are at the end for anyone who wants them. Informational only. This brief reports market data and publicly available news. It is not investment, READ MORE
Monotonic Stack Pattern in C++: 13 LeetCode Problems, One Rule for Popping
Thirteen LeetCode problems, three of them rated Hard, and a single sentence that decides all of them. This post works through Joseph Choi’s stack session deck in C++ and tries to answer the question the problem tags never answer: not which data structure, but when does an entry stop being useful? Every solution here was compiled with -fsanitize=undefined,address and checked against a brute-force implementation on tens of thousands of random inputs before it went into the post. Where the deck’s code has a latent trap, I say so and show the version I would submit. The one idea In all READ MORE
Bitcoin Daily Brief — September 10, 2026: The Squeeze Breaks Downward as a PPI Overshoot Takes BTC to $76,537
Bitcoin price on September 10, 2026: BTC closed at $76,537, down 2.23%, in a $2,114 range between a $78,554 high and a $76,440 low — the largest daily decline since August 28, a fourth consecutive lower close, and the session in which the eleven-day Bollinger squeeze this brief has tracked all week finally expanded, taking %B to 0.07 and leaving the close $317 above the lower band after an August producer-price reading pushed thirty-year Treasury yields to a nineteen-year high. The snapshot and charts are first, the short version follows, and the full explanations are at the end for anyone READ MORE
Bitcoin Daily Brief — September 9, 2026
Bitcoin price on September 9, 2026: BTC closed at $78,284, down 0.21%, in a $2,026 range between a $79,753 high and a $77,727 low — a session whose candle body measured just $165, and which ended a twenty-three-day run of closes above the 20-day average while Bollinger band width contracted for an eleventh straight day to 5.57%, the narrowest since August 18 and within a rounding of the level this brief projected a day earlier. The snapshot and charts are first, the short version follows, and the full explanations are at the end for anyone who wants them. Informational only. READ MORE
LeetCode Queue Design Patterns in C++: Put the Answer at an Edge
LeetCode Queue Design Patterns in C++: Put the Answer at an Edge LeetCode Queue Design Patterns in C++: Put the Answer at an Edge nycomdorics.com · preview of the WordPress post · source deck by Joseph Choi A binary heap will hand you its smallest element instantly and tell you nothing whatsoever about the second smallest. A std::vector will append and remove at the back in constant time and charge you a full shift to remove from the front. Every structure in this family is generous at its edges and useless in its interior. So the design job is always READ MORE
Bitcoin Daily Brief — September 8, 2026: The Golden Cross Prints at $78,447 as Band Width Falls a Tenth Day to 8.4%
Bitcoin price on September 8, 2026: BTC closed at $78,447, down 0.82%, in a $1,888 range between a $79,477 high and a $77,589 low — a session in which the 50-day moving average finally crossed above the 200-day, the first golden cross since May 2025, while price itself finished $18 from its own 20-day average and Bollinger band width contracted for a tenth straight day to 8.4%. The snapshot and charts are first, the short version follows, and the full explanations are at the end for anyone who wants them. Informational only. This brief reports market data and publicly available READ MORE
LeetCode Linked List Patterns in C++: Recovering the Context a Node Doesn’t Have
A linked list node knows exactly one thing about the world: what comes after it. Not what came before, not how far it is from the end, not whether the walk you started will ever terminate. Every technique in this post exists to recover one of those facts. That is the whole pattern. Array problems start with random access, a length, and a stable index for every element. Linked list problems start with none of that, and the interviewer is testing whether you can rebuild the specific piece you need in one pass and constant space. Once you see a READ MORE
Bitcoin Daily Brief — September 7, 2026: $79,092 Close as the Squeeze Tightens to 13%; 50-Day Now $124 From the 200-Day
Bitcoin price on September 7, 2026: BTC closed at $79,092, down 1.55%, in a $1,796 range between an $80,462 high and a $78,666 low — a Labor Day session in which $80,000 was given back, while underneath it the 50-day moving average finished $124 from the 200-day and Bollinger band width collapsed to 13.3%, a third of where it stood nine days ago. The snapshot and charts are first, the short version follows, and the full explanations are at the end for anyone who wants them. Informational only. This brief reports market data and publicly available news. It is not READ MORE
Decrease and Conquer in C++: Twelve LeetCode Problems That Throw the Search Space Away
Decrease and conquer on LeetCode is the habit of proving that a whole block of candidates cannot possibly hold the answer, and then deleting it without looking. Twelve problems here run on that one move: 167, 11, 42, 121, 53, 1014, 169, 240, 277, 280, plus two that are worth including precisely because one of them isn’t this pattern at all and the other should be. All the code here compiles and runs against the sample cases plus the edge cases listed at the bottom. More problems: the LeetCode series. The twelve problems at a glance # Problem Difficulty Shape READ MORE
Bitcoin Daily Brief — September 6, 2026: $80,339 Weekly Close Lands $4 Under the 50-Week Average; Golden Cross Due Tuesday
Bitcoin price on September 6, 2026: BTC closed at $80,339, up 0.64%, in a $1,314 range between an $80,564 high and a $79,250 low — and because Sunday’s daily candle is also the weekly candle, that close settled $4.25 below the 50-week moving average, the closest a weekly close has come to that line in forty-three weeks. The snapshot and charts are first, the short version follows, and the full explanations are at the end for anyone who wants them. Informational only. This brief reports market data and publicly available news. It is not investment, trading, or financial advice, and READ MORE