Ashutosh Dash

PhD || IIT Kharagpur ||
RT/QT=/=ENDORSEMENT

[SCR @SCR01111]

DSA Preparation Roadmap (From Zero to OA Ready)

1. Sliding Window: 3, 76, 209, 424, 567, 904
2. Two Pointers: 11, 15, 16, 18, 42, 167
3. Fast/Slow Pointers (Linked List): 141, 142, 19, 876, 160, 234
4. Binary Search on Sorted Data: 33, 34, 35, 153, 162, 704
5. Binary Search on Answer: 875, 1011, 410, 774, 1283, 1482
6. Hashing / Frequency Maps: 1, 49, 128, 217, 242, 347
7. Prefix Sum / Running Sum: 303, 560, 724, 930, 974, 523
8. Difference Array / Range Updates: 370, 1094, 1109, 1893, 1943, 2381
9. Monotonic Stack: 739, 496, 503, 84, 85, 901
10. Monotonic Queue / Deque: 239, 862, 1425, 1438, 1499, 1696
11. Heap / Top K: 215, 347, 692, 703, 973, 1046
12. Intervals: 56, 57, 252, 253, 435, 452
13. Greedy Scheduling / Sorting: 45, 55, 406, 621, 763, 134
14. Linked List Manipulation: 21, 23, 24, 25, 92, 138
15. Tree DFS: 104, 112, 113, 543, 124, 226
16. Tree BFS / Level Order: 102, 103, 199, 515, 637, 116
17. BST Problems: 98, 99, 230, 235, 450, 700
18. Backtracking Basics: 46, 47, 77, 78, 90, 39
19. Backtracking with Constraints: 40, 17, 79, 131, 51, 52
20. Graph BFS / DFS: 200, 695, 733, 994, 1091, 1254
21. Topological Sort / DAG: 207, 210, 802, 1462, 1203, 2115
22. Union Find / DSU: 547, 684, 1319, 1579, 990, 1202
23. Shortest Path: 743, 787, 1514, 1631, 1334, 1976
24. MST / Graph Greedy: 1584, 1135, 1168, 1489, 778, 1102
25. Trie: 208, 211, 212, 648, 677, 1268
26. Bit Manipulation: 136, 137, 191, 338, 268, 190
27. 1D DP Basics: 70, 198, 213, 322, 279, 300
28. Knapsack / Subset DP: 416, 494, 518, 474, 1049, 879
29. Grid DP: 62, 63, 64, 221, 931, 120
30. String DP / Sequence DP: 1143, 72, 115, 583, 97, 1312

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How to use this list?
- These numbers are Leetcode problem numbers
- Do 3 patterns at a time, not all 30 together.
- For each pattern, solve the first 2 to understand the idea, the next 2 to get repetition, and the last 2 to stretch yourself.
- After every pattern, write one reusable template from memory.
- Do not just “solve and move on.” Ask: what signal in the question pointed to this pattern?
- If you get stuck, revisit the same pattern after 3 to 4 days. Pattern recognition is built by spacing, not cramming.

[Ashutosh Dash @mrashutoshdash]

@suchetadalal @Wangchuk66 Like Kejriwal ji

[Ashutosh Dash @mrashutoshdash]

@manas_muduli The driver must be punished appropriately.

[Ashutosh Dash @mrashutoshdash]

@IndianGems_ Our cities also follow/use the same procedure/technology. The issue is something else.

[Ashutosh Dash @mrashutoshdash]

@shydev69 So true

[Ashutosh Dash @mrashutoshdash]

@NHAI_Official kindly clarify this. @nitin_gadkari

[Sudhir Chaudhary @sudhirchaudhary]

सड़क की लागत : ₹1896 करोड़
टोल टैक्स वसूला : ₹8349 करोड़
एक दर्शक ने हमें पत्र लिखकर शिकायत की
हमने RTI से जानकारी निकाली।

[Ashutosh Dash @mrashutoshdash]

@indiantweeter @nishant_india 200-250.

[Ashutosh Dash @mrashutoshdash]

@chiragbarjatya Mine is a village in Khordha district of Odisha. Here power outage only during thunderstorms or else we get 24hrs power supply even in peak summer.

[Ashutosh Dash @mrashutoshdash]

@chiragbarjatya Rs. 40 only. That to farm fresh.

[Ashutosh Dash @mrashutoshdash]

@theskindoctor13 Puri, Odisha. @sambitswaraj has a chance. But he has to campaign properly.

[Ashutosh Dash @mrashutoshdash]

@indiantweeter Puri, Odisha. Most probably BJD.

[Ashutosh Dash @mrashutoshdash]

@TajinderBagga @ArvindKejriwal He has one sitting MLA there.

[Ashutosh Dash @mrashutoshdash]

@rishibagree Not only in Kolkata it is a pan India situation.

[Ashutosh Dash @mrashutoshdash]

@ShivAroor This is indeed called a confusion Matrix in machine learning.

[Ashutosh Dash @mrashutoshdash]

@ParveenKaswan 80/kg

[Ashutosh Dash @mrashutoshdash]

@rishibagree Don't connect the dots. Just trace who was the corresponding MP who arranged the visitor pass. It happens. However we should learn from this incident.

[Ashutosh Dash @mrashutoshdash]

@TimesAlgebraIND What is big breaking news here? Isn't it obvious?

[Ashutosh Dash @mrashutoshdash]

@ankursingh @ashokgehlot51 Who is stopping BJP to form the govt immediately and take charge of law and order situation.

[Ashutosh Dash @mrashutoshdash]

@besugarfit Don't make mockery of someone's health condition. Don't claim in a straight face which you can't achieve.

[Ashutosh Dash @mrashutoshdash]

@Rubenbanerjee @thewire_in You know nothing about Odisha politics and also ground reality. Come and spend some time in villages to know it better.