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残酷刷题群动态规划的套路小讲座残酷群2020年会残酷群2021年会
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GitHub代码Lee215 特别节目
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No.TitleDateTag 1Tag 2LeveldifficultyYouTubeRecording DateB站
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3405Find the Lexicographically Largest String From the Box IStringHard
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1163Last Substring in Lexicographical OrderStringHard
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2800Shortest String That Contains Three StringsStringThinkingMedium1855
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420Strong Password CheckerStringMedium-
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2468Split Message Based on Limit
StringMedium2381https://youtu.be/oOWb_CQU5xo11/13/2022
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527*Word AbbreviationStringMedium-https://youtu.be/G-0QGOGea5M11/6/2022
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68Text JustificationStringMedium-https://youtu.be/6D7YFoQ4t0w2/5/2022
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418*Sentence Screen FittingStringMedium-https://youtu.be/0WD0M2GmVTw1/4/2022https://www.bilibili.com/video/BV16P4y1E75D/
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3388Count Beautiful Splits in an ArrayRolling Hash
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2781Length of the Longest Valid SubstringRolling HashIntervalsHard2203https://youtu.be/iYkzMZV4paE1/26/2024
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2261K Divisible Elements SubarraysRolling HashMedium1724https://youtu.be/VAdD8NF-Xoc5/1/2022
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3068Find the Maximum Sum of Node ValuesOthersMedium2267https://youtu.be/CF7rTxasbow3/2/2024
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3092Most Frequent IDsSorted ContainerMedium1793N/A
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3219Minimum Cost for Cutting Cake IIGreedyHard1789https://youtu.be/RsTV4u3hsxg7/15/2024
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2459*Sort Array by Moving Items to Empty SpaceGreedy-
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3113Find the Number of Subarrays Where Boundary Elements Are MaximumStackMedium2046https://youtu.be/FViZk7J_SHE4/20/2024
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3387Maximize Amount After Two Days of ConversionsGraphFloydMedium
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3017Count the Number of Houses at a Certain Distance IIGraphHard2709https://youtu.be/kNAxf5U_jLU1/21/2024https://www.bilibili.com/video/BV1a2421F7Tq/
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3377Digit Operations to Make Two Integers EqualGraphDijkstra Medium
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3342Find Minimum Time to Reach Last Room IIGraphDijkstra Medium1861
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3362Zero Array Transformation IIIDiff ArrayPriority QueueHard2423
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3356Zero Array Transformation IIDiff ArrayBinary SearchMedium1913
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3355Zero Array Transformation IDiff ArrayMedium1591
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3347Maximum Frequency of an Element After Performing Operations IIDiff ArrayHard2155
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3346Maximum Frequency of an Element After Performing Operations IDiff ArrayMedium1864
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3378Count Connected Components in LCM GraphUnion Find
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3372Maximize the Number of Target Nodes After Connecting Trees ITreeMedium
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3373Maximize the Number of Target Nodes After Connecting Trees IITreeReRootHard
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3367Maximize Sum of Weights after Edge RemovalsTreeGreedyHard
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3348Smallest Divisible Digit Product IIdigit coutingHard
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3449Maximize the Minimum Game ScoreBinary SearchHardhttps://youtu.be/N6aScon-ehY2/10/2025
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3399Smallest Substring With Identical Characters IIBinary SearchHardhttps://youtu.be/AdT2F0x-uKo1/2/2025
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3447Assign Elements to Groups with ConstraintsEnumerationMediumhttps://youtu.be/YCNZmqfCswE2/9/2025
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3448Count Substrings Divisible By Last DigitHashPrefixHardhttps://youtu.be/7VDPEki9qX42/9/2025
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3463Check If Digits Are Equal in String After Operations IICombinatoricsHardhttps://youtu.be/grXNc-Tqgng2/24/2025
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3459Length of Longest V-Shaped Diagonal SegmentDFSMediumhttps://youtu.be/5CvMx5TKsX02/18/2025
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3012Minimize Length of Array Using Operations3/20/2025GreedyConstructiveHard1832https://youtu.be/BA_MBQU0Rew1/23/2024
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3133Minimum Array End3/19/2025GreedyConstructiveMedium1934https://youtu.be/qjo7da3eNDQ4/28/2024
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3301Maximize the Total Height of Unique Towers3/18/2025GreedyConstructiveMedium1448N/A
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3397Maximum Number of Distinct Elements After Operations3/17/2025GreedyConstructiveMediumN/A
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2749Minimum Operations to Make the Integer Zero3/16/2025GreedyConstructiveMedium2132https://youtu.be/AlsaJFDF_P07/4/2023https://www.bilibili.com/video/BV1F84y1m7Qc/
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2732Find a Good Subset of the Matrix3/15/2025GreedyConstructiveHard2239https://youtu.be/HiuE4XSdP5U6/10/2023https://www.bilibili.com/video/BV1LH4y1f77D/
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2745Construct the Longest New String3/14/2025GreedyConstructiveMedium1607https://youtu.be/tXs9HaS2Pns7/4/2023https://www.bilibili.com/video/BV1MG411m7Qq/
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SKIPPED3/13/2025
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SKIPPED3/12/2025
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2576Find the Maximum Number of Marked Indices3/11/2025GreedyConstructiveHard1843https://youtu.be/lO7HAZUBzok2/26/2023https://www.bilibili.com/video/BV1fv4y1E7nt/
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2573Find the String with LCP3/10/2025GreedyConstructiveHard2681https://youtu.be/07KRNyie-Lk2/20/2023https://www.bilibili.com/video/BV1iX4y1B7wG/
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2571Minimum Operations to Reduce an Integer to 03/9/2025GreedyConstructiveMedium1649https://youtu.be/e7pDcbd_NfI2/19/2023https://www.bilibili.com/video/BV1bv4y1E76H/
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2568Minimum Impossible OR3/8/2025GreedyConstructiveMedium1754https://youtu.be/ROoz5NI6CIM2/19/2023https://www.bilibili.com/video/BV13h411E7ag/
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2567Minimum Score by Changing Two Elements3/7/2025GreedyConstructiveMedium2567https://youtu.be/264neqgF3gM2/19/2023https://www.bilibili.com/video/BV19V4y1D718/
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2546Apply Bitwise Operations to Make Strings Equal3/6/2025GreedyConstructiveMedium1604https://youtu.be/6eyfhmVmrfk1/22/2023https://www.bilibili.com/video/BV1As4y1D7Zd/
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2561Rearranging Fruits3/5/2025GreedyConstructiveHard2221https://youtu.be/rcYB1MbmmiM2/11/2023https://www.bilibili.com/video/BV13N411T7CQ/
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2499Minimum Total Cost to Make Arrays Unequal3/4/2025GreedyConstructiveHard2633https://youtu.be/WGcjEzidnEA12/11/2022https://www.bilibili.com/video/BV1om4y1r71F/
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SKIPPED3/3/2025
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2498Frog Jump II3/2/2025GreedyConstructiveHard1759https://youtu.be/k2ecWk6ckLw12/11/2022https://www.bilibili.com/video/BV1hT41167qX/
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SKIPPEd3/1/2025
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2202Maximize the Topmost Element After K Moves2/28/2025GreedyConstructiveHard1717https://youtu.be/HVZS7flaRQA3/23/2022https://www.bilibili.com/video/BV1Cq4y1v7qY/
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1798Maximum Number of Consecutive Values You Can Make2/27/2025GreedyConstructiveHard1931https://youtu.be/X1Jp55_-H_A3/20/2021https://www.bilibili.com/video/BV1LV411n7d7/
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3394Check if Grid can be Cut into Sections2/26/2025GreedyIntervalsMedium1916
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3458Select K Disjoint Special Substrings2/25/2025GreedyIntervalsMediumhttps://youtu.be/PSfQAtKPXU42/17/2025
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3104*Find Longest Self-Contained Substring2/24/2025GreedyIntervalsMedium-
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1520Maximum Number of Non-Overlapping Substrings2/23/2025GreedyIntervalsHard2362https://youtu.be/s6go3_sTPAY
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646Maximum Length of Pair Chain2/22/2025GreedyIntervalsMedium-https://youtu.be/7ZPiZQUAD741/7/2021https://www.bilibili.com/video/BV1dp4y1s7ST/
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435Non-overlapping Intervals2/21/2025GreedyIntervalsMedium-https://youtu.be/x6wREca18nw12/29/2020https://www.bilibili.com/video/BV1P5411n7Bb/
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3444Minimum Increments for Target Multiples in an Array2/20/2025DPBit MaskHardhttps://youtu.be/SOVENzgfUrs2/13/2025
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3393Count Paths With the Given XOR Value2/19/2025DPMedium1573
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3376Minimum Time to Break Locks I2/18/2025DPBit MaskMedium1793
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SKIPPED2/17/2025
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3366Minimum Array Sum2/16/2025DP2040
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3363Find the Maximum Number of Fruits Collected2/15/2025DP2404
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3351Sum of Good Subsequences2/14/2025DP2085
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3350Adjacent Increasing Subarrays Detection II2/13/2025DPMedium1600
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3326Minimum Division Operations to Make Array Non Decreasing2/12/2025DP1864
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3259Maximum Energy Boost From Two Drinks2/11/2025DPMedium1483N/A
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3290Maximum Multiplication Score2/10/2025DPMedium1692
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3209Number of Subarrays With AND Value of K
2/9/2025Bitwise HashingMediumhttps://youtu.be/MPDkaH9x9Yo7/6/2024
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SKIPPED2/8/2025
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3428Maximum and Minimum Sums of at Most Size K Subsequences2/7/2025CombinatoricsMediumhttps://youtu.be/0n-eoRoD31Y2/8/2025
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3395Subsequences with a Unique Middle Mode I2/6/2025CombinatoricsHard
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3405Count the Number of Arrays with K Matching Adjacent Elements2/5/2025CombinatoricsMediumhttps://youtu.be/V2AN0SKinW01/1/2025
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2954Count the Number of Infection Sequences2/4/2025CombinatoricsInverse ElementHard2644https://youtu.be/kVRnMs4og8812/22/2023https://www.bilibili.com/video/BV1um411Q7DK/
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2930Number of Strings Which Can Be Rearranged to Contain Substring2/3/2025CombinatoricsDPMedium2227https://youtu.be/0V95_GZH6DM11/21/2023https://www.bilibili.com/video/BV1NF4m1j7rb/
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2400Number of Ways to Reach a Position After Exactly k Steps2/2/2025CombinatoricsMedium1751https://youtu.be/1OdZ5lrdHPY9/5/2022https://www.bilibili.com/video/BV1nP41137q5/
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2221Find Triangular Sum of an Array2/1/2025CombinatoricsMedium1317https://youtu.be/RzoHl7M9xvM4/6/2022https://www.bilibili.com/video/BV11D4y1x7ZR/
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1916Count Ways to Build Rooms in an Ant Colony1/31/2025CombinatoricsDPHard2486https://youtu.be/yfBHIDVN8Vs6/27/2021https://www.bilibili.com/video/BV1tg411u7t6/
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1866Number of Ways to Rearrange Sticks With K Sticks Visible1/30/2025CombinatoricsDPHard2333https://youtu.be/y4Pn4jxCw7E5/16/2021https://www.bilibili.com/video/BV13U4y1b7Vi/