以下文章来源于数据结构和算法 ，作者博哥 数据结构和算法 . --------------下面是今天的算法题-------------- 来看下今天的算法题，这题是LeetCode的第 2976题：转换字符串的最小成本 I，难度是中等。 给你两个下标从 0 开始的字符串 source 和 target ，它们的长度均为 n 并且由小写英文字母组成。 另给你两个下标从 0 开始的字符数组 original 和 changed ，以及一个整数数组 cost ，其中 cost[i] 代表将字符 original[i] 更改为字符 changed[i] 的成本。 你从字符串 source 开始。在一次操作中，如果存在任意下标 j 满足 cost[j] == z 、original[j] == x 以及 changed[j] == y 。你就可以 选择字符串中的一个字符 x 并以 z 的成本将其更改为字符 y 。 返回将字符串 source 转换为字符串 target 所需的最小成本。如果不可能完成转换，则返回 -1 。 注意，可能存在下标 i 、j 使得 original[j] == original[i] 且 ch ...

库克深入谈及退休规划，腾讯、阿里、百度掀起春节前AI大模型的红包大战，松下宣布裁员规模可能 增至1.2万人。 2月5日，苹果CEO库克主持召开一场全员大会，描绘了人工智能（AI）将如何重塑苹果的未来，同时 深入谈及了退休和继任规划。他谈到："大家都清楚，人到了一定年纪，有些人会选择退休，这是很自 然的事。"库克表示自己花很多时间思考5年后、10年后，甚至15年后谁会坐在这个房间里。思考这些事 情并制订计划，是领导力的重要组成部分。 【点评】：已经年满65岁的库克退休传闻去年下半年开始升温。目前，新任首席运营官萨比·汗已全面 接手运营工作，并正致力于解决行业内普遍面临的内存芯片短缺问题。随着苹果继任者规划逐渐浮出水 面，苹果面临的问题是，公司需要的是一位创新者，还是另一位精明的管理者？是一位像库克那样通过 让公司变得更具可预测性和渐进性而成功的领导者，还是一位像乔布斯那样通过冒险来押注未来的富有 远见的产品规划师？ 腾讯、阿里、百度春节撒45亿红包 2026年马年春节前夕，红包大战再度升级，腾讯、阿里、百度三大巨头累计投入超45亿元，且首次将 AI作为核心驱动，开启"红包+AI"的全新玩法。阿里千问斥资最高，达 ...

Core Viewpoint - Big Tech companies are planning to invest approximately $700 billion in capital expenditures by 2026, primarily focused on AI infrastructure, which includes data centers and related equipment [1][21]. Investment Plans - The five major companies are expected to contribute to 2.1% of current-dollar GDP through these investments [2]. - Other companies are also increasing capital expenditures, indicating a broader economic stimulus as long as this trend continues [3]. Share Buybacks and Funding Sources - Concerns exist that the increased spending may come at the expense of share buybacks, which have already begun to decline [2][7]. - The funding for the $700 billion investment will come from various sources, including reduced share buybacks, new share issuances, and debt issuances [5][9][19]. - Specific companies have already shifted from share buybacks to issuing new shares, such as Oracle, which issued $2.1 billion in new shares in 2025 [5][13]. Financial Performance and Debt - In Q4, share buybacks for the five companies dropped to $12.6 billion, the lowest since Q1 2018, compared to a peak of $149 billion in 2021 [7]. - Companies like Amazon and Meta have significantly reduced their share buybacks to allocate funds for AI investments [6][8]. - Oracle's recent bond offerings have seen high demand, indicating strong investor interest in corporate debt [16][19]. Operating Cash Flow - The operating cash flows for these companies are substantial, with Amazon generating $126 billion and Alphabet $127 billion in 2025, which can help fund the planned investments [20][23]. - Utilizing operating cash flow for investments is seen as a positive contribution to economic growth [23]. Economic Impact - The shift from share buybacks to investments in AI infrastructure is expected to stimulate economic growth, although it may not be well-received by shareholders [21][22]. - The overall investment strategy is viewed as a significant stimulus for the economy, provided that financial markets remain stable [23].

Investment Rating - The report maintains a positive outlook on the communication equipment and services industry, particularly focusing on investment opportunities in CPO and related supply chain companies [3][11]. Core Insights - North American cloud vendors have reported better-than-expected earnings, with significant capital expenditure guidance increases from major players like Google and Amazon, indicating strong growth in the AI computing industry chain [3][11]. - The report highlights the rapid growth of the optical communication industry driven by AI applications, with leading companies achieving record highs in stock performance [6][9]. - The transition from Scale-OUT to Scale-UP in optical applications is emphasized, suggesting a broadening of application scenarios and increased demand for optical modules and components [6][9]. Summary by Sections Weekly Viewpoint - The optical communication sector is experiencing unprecedented growth, with major cloud companies significantly increasing capital expenditures, leading to a strong performance in the optical communication supply chain [9]. - The report notes that while the market is currently experiencing fluctuations, long-term investment opportunities are becoming more apparent, particularly in the context of rising prices for optical fibers and components [9]. Industry News - Major cloud service providers like Google and Amazon have substantially raised their capital expenditure forecasts for 2026, with Google estimating between $175 billion and $185 billion, nearly double that of 2025, and Amazon projecting around $200 billion, a 50% increase from the previous year [11][24][25]. - The report discusses the implications of a recent tax increase on value-added services in China, which may impact the revenue and profit margins of major telecom operators [12]. Investment Highlights - The report indicates that the proportion of holdings in the optical communication sector has increased, reflecting a positive market sentiment driven by AI-related infrastructure investments [11][41]. - The domestic new generation computing infrastructure is set to enter a new cycle, with significant opportunities arising from the ongoing global infrastructure wave [11][41]. - The report suggests that the AI-driven network upgrades will enhance communication capabilities, leading to rapid advancements in network innovation and technology applications [11][41].

Group 1 - The core narrative is that the story of AI is shifting from "software eating the world" to "hardware being constrained by the world," highlighting a growing risk in the investment landscape due to political and physical limitations on data center expansion [1][15] - A rare bipartisan consensus has emerged between Senator Bernie Sanders and Governor Ron DeSantis regarding the need to halt the rapid increase of data centers, driven by public concerns over the negative impacts of AI [2][3] - The political landscape is changing, with states like New York, Arizona, Georgia, and Texas considering legislation to pause new data center projects or eliminate tax incentives, reflecting a growing backlash against the expansion of AI infrastructure [2][3] Group 2 - The anticipated capital expenditure of approximately $600 billion in 2026 faces skepticism regarding its feasibility, as major tech companies plan to spend $670 billion on AI infrastructure this year alone [4][6] - The energy demand from data centers is projected to double by 2035, raising concerns about whether the current U.S. power grid can meet this demand, which is already causing regulatory issues in Texas [8][9] - The financial markets are reacting to the risk of unspent capital, leading to significant sell-offs in tech stocks and a shift towards defensive sectors, indicating a potential reevaluation of the AI investment landscape [10][12][13]

Group 1 - The core viewpoint of the article highlights a significant sell-off in software stocks, leading to a substantial profit of $24 billion (approximately 166 billion RMB) for short sellers amid a broader market downturn in technology stocks [2][3]. - S3 Partners reported that short sellers have increased their positions in major tech stocks, particularly in the software sector, despite many leading companies experiencing significant price declines [3][4]. - The software sector has seen a market capitalization loss of $1 trillion, with notable short-selling activity in companies like Microsoft, Amazon, Oracle, and Broadcom [3][4]. Group 2 - The article discusses a shift in investor sentiment, with a noticeable move towards defensive strategies as the market faces valuation concerns and a potential withdrawal of funds from previously favored assets like tech stocks and cryptocurrencies [5][6]. - Analysts have pointed out that the current environment reflects a structural sell-off in the software industry, with some investors questioning the relevance of software companies in the age of artificial intelligence [6]. - Despite the prevailing skepticism, some analysts argue that the software industry is not obsolete and can still thrive, as evidenced by companies like Palantir [6].

Group 1 - OpenAI's first hardware product is named Dime, resembling Apple's AirPods, and is expected to be released this year. The company has shifted its strategy from developing a high-end device to focusing on a simpler AI audio headset due to high hardware costs and component price increases caused by a shortage of storage chips [2] - Bubble Mart's founder Wang Ning announced that LABUBU's global sales exceeded 100 million units last year, with plans for the company to have over 10,000 employees and 100 million registered members by 2025 [3] - Tesla plans to increase investments in AI hardware and software, as well as energy sectors in China, with a projected capital expenditure exceeding $20 billion globally in 2026 [8] Group 2 - Amazon will change its policy on sharing reviews among product variants starting February 12, 2026, to improve customer trust and reduce return rates [8] - The German industrial output declined by 1.1% in 2025, marking the fourth consecutive year of decline, primarily due to weak automotive production [14] - The second-hand car market in China is projected to see a cumulative transaction volume of 20.11 million units in 2025, with a year-on-year increase of 2.5% [14]

炒股就看金麒麟分析师研报，权威，专业，及时，全面，助您挖掘潜力主题机会！ 软件股抛售潮，余波未了！ 据最新消息，随着科技股与软件股遭遇猛烈抛售，做空者近期斩获的浮盈已高达240亿美元（约1660亿 元人民币）。 S3 Partners着重提到了几只被空头持续做空的软件类股票，包括微软、亚马逊、甲骨文、博通等。该机 构表示，在上述科技股中，微软尤为引人注目，因为在其股价持续走低之际，空头对其的操作策略发生 了明显转变。"以往，微软走势更像反转股，跌势中空头会选择回补平仓；如今却表现得像一只受情绪 驱动的问题股，空头趁弱势反而加码押注。"S3 Partners写道。 尽管近期人工智能题材备受质疑，但S3 Partners认为当前的普遍看空情绪主要集中在软件板块。追踪纳 斯达克100指数的景顺QQQ ETF以及"美股七巨头"（Magnificent 7）整体的空头兴趣并未明显增加。 不过，S3 Partners强调，对冲基金仍在加大对大型科技股的空头布局，即便其中不少龙头企业股价已大 幅回调。该机构表示："空头仓位蔓延迹象明显，微软今年空头兴趣跃升20%，甲骨文增长10%，博通 和亚马逊的空头兴趣分别上升了15%和 ...

Core Viewpoint - Amazon reported a strong fourth-quarter revenue of $213.39 billion, exceeding Wall Street expectations, but shares fell sharply due to concerns over significant future capital expenditures [2][3]. Financial Performance - Fourth-quarter net sales reached $213.39 billion, marking a 14% year-over-year increase and surpassing the expected $211.30 billion [2]. - The company guided first-quarter revenue to a range of $173.5 billion to $178.5 billion, aligning with consensus estimates [2]. Capital Expenditure Plans - CEO Andy Jassy announced plans for Amazon to invest approximately $200 billion in capital expenditures by 2026, focusing on artificial intelligence infrastructure, custom chips, robotics, and satellite networks [3]. - Projected capital expenditure growth for 2026 is estimated at 54%, a significant increase from previous expectations [4][5]. Market Reaction - Following the announcement, Amazon's stock closed down 4.42% at $222.69 and fell an additional 11.20% to $197.75 in after-hours trading [3]. - Analysts, including Gene Munster from Deepwater Asset Management, suggested that the market's negative reaction overlooks the long-term benefits of increased capital expenditures [4]. Analyst Perspectives - Jim Cramer from CNBC acknowledged the near-term stock pressure but defended the rationale behind Amazon's spending, indicating that the investments can be justified [6][7].

Recent data on the U.S. job market has flashed some worrying signs lately, but the construction industry sees greater demand for workers. The Associated Builders and Contractors trade group estimated in a report last month the industry will need to bring in 456,000 new workers in 2027, up 30.7% from the 349,000 needed this year. “Failing to do so will worsen labor shortages, especially in certain occupations and regions, placing further upward pressure on labor costs,” ABC Chief Economist Anirban Basu ...