Raj U Yadav @rajuy004

dev +Blockchain + web3 + dsa +cybersecurity

 Mumbai,India
Joined November 2018
Day 39 #75DaysDSAChallenge Pinned LeetCode 28: strStr() (Brute: slide & compare substrings) — "sadbutsad" + "sad" → 0 Your "find in the mess" hack? #DSA #LeetCode #String #CodingChallenge #CONNECT
Day 38 #75DaysDSAChallenge ✂️⚡ Trimmed LeetCode 58: Length of Last Word (Trim spaces, reverse count non-spaces till space) " fly me to the moon " → 4 Your "trim the fat" code hack? #DSA #LeetCode #String #CodingChallenge #ProblemSolving #LearningInPublic #CONNECT
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Day 37 #75DaysDSAChallenge Balanced LeetCode 20: Valid Parentheses (Stack: push open, pop & match close — empty at end) ([)] → false Your "match the pair" life hack? #DSA #LeetCode #Stack #CodingChallenge #CONNECT
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Day 36 #75DaysDSAChallenge Doubled: LeetCode 412 FizzBuzz (modulo cascade) → 3 ms LeetCode 14 Longest Common Prefix (shrink till match) → Simple logic, max impact Your "shrink to win" move? #DSA #LeetCode #String #CodingChallenge #CONNECT
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Day 35 #75DaysDSAChallenge Maxed LeetCode 424: Character Replacement (Sliding window: expand, track max freq, shrink if edits > k) "AABABBA" + k=1 → 7 Your "k edits to win" move? #DSA #LeetCode #SlidingWindow #CodingChallenge #CONNECT
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Day 34 #75DaysDSAChallenge Cracked LeetCode 3: Longest Substring No Repeats (Sliding window + lastSeen map → reset start on repeat) — "abcabcbb" → 3 Your "forget to move on" hack? #DSA #LeetCode #SlidingWindow #CodingChallenge #CONNECT
Day 33 #75DaysDSAChallenge Decoded LeetCode 13: Roman to Integer (Map + scan: if s[i] < s[i+1] → subtract, else add) — MCMXCIV → 1994 Your “subtract to win” hack? #DSA #LeetCode #String #CodingChallenge #CONNECT
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Day 32 #75DaysDSAChallenge Validated LeetCode 36: Valid Sudoku (3 sets: rows, cols, boxes — boxIndex = (r/3)*3 + c/3) rules enforced, no violations Your "fake solution" catch? #DSA #LeetCode #Hashing #CodingChallenge #CONNECT #LearningInPublic
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Day 31 #75DaysDSAChallenge 🏠🔄 Broke LeetCode 213: House Robber II (Circle? Split: rob 0→n-2 or 1→n-1, max of both — O(1) circular logic? Cracked 😎 Ever "split to win"? #DSA #LeetCode #CodingChallenge #DynamicProgramming #ProblemSolving #LearningInPublic #CONNECT
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Unlocked LeetCode 39: Combination Sum (Backtrack: pick (same idx) or skip (next) — target sum, no dups) 30 day milestone, combos complete 😎 Best "sum combo" you’ve nailed? #DSA #LeetCode #CodingChallenge #Backtracking #ProblemSolving #LearningInPublic #connectUnlocked
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Day 29 #75DaysDSAChallenge 🌀⚡ Unwound LeetCode 59: Spiral Matrix II (Layer shrinks: top L-R, right T-B, bottom R-L, left B-T — fill 1-n²) grid maze conquered, no dead ends 😏 Spiral through chaos hack? #DSA #LeetCode #CodingChallenge #ProblemSolving #LearningInPublic #connect
Day 28 #75DaysDSAChallenge 🗺️⚡ Navigated LeetCode 240: Search 2D Matrix II (Corner start: top-right slide left/down based on >/< target — O(m+n))😏 Smart-start hack in your code? #DSA #LeetCode #CodingChallenge #ProblemSolving #LearningInPublic #CONNECT
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Day 27 #75DaysDSAChallenge 🕵️‍♂️⚡ Hunted LeetCode 74: Search 2D Matrix (1D binary: mid/n row, mid%n col — log(m*n) spy work) — matrix maze? Flattened & found 😏 Flatten a tough problem lately? #DSA #LeetCode #CodingChallenge #BinarySearch #ProblemSolving #LearningInPublic #CONNECT
Day 26 #75DaysDSAChallenge 🏠💰 Heisted LeetCode 198: House Robber (DP: max(prev1, prev2 + nums[i]) — skip neighbors, max loot O(n))robbed the houses, not the runtime 😏 Toughest "skip for win" choice you've made? #DSA #LeetCode #CodingChallenge #DynamicProgramming #CONNECT #sol
Day 25 #75DaysDSAChallenge ⏰🔄 Doubled: LeetCode 283 Move Zeroes (pointers shuffle zeros back) + 981 TimeMap (map<vector<pair<ts,val>>>, binary get <= ts) — noise out, history in 😏 Timestamp query hack? #DSA #LeetCode #CodingChallenge #BinarySearch #ProblemSolving #CONNECT
Day 24 #75DaysDSAChallenge 🇳🇱⚡ Striped LeetCode 75: Sort Colors (Three pointers: low 0s, mid 1s, high 2s — swap & partition O(n)) chaos to flag in one sweep 😏 Best "sort hack" for real life? #DSA #LeetCode #CodingChallenge #ProblemSolving #LearningInPublic #CONNECT
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Day 23 #75DaysDSAChallenge 🔤🔍 Decoded LeetCode 14: Longest Common Prefix (Base first str, loop compares till mismatch — slice & done) words united at the start, diverged later 😏 Weirdest prefix you've found? #DSA #LeetCode #CodingChallenge #ProblemSolving #connect
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Day 22 #75DaysDSAChallenge 🔄🧩 Unlocked LeetCode 31: Next Permutation (Scan dip, swap successor, reverse suffix — O(n) evolution) from "stuck sequence" to smooth next 😏 Code "next step" that saved you? #DSA #LeetCode #CodingChallenge #ProblemSolving #LearningInPublic #CONNECT
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Day 21 #75DaysDSAChallenge 💧🏢 Filled LeetCode 11: Container With Most Water (Two pointers: min(h[l],h[r]) * width, shrink short side)from dry spell to max puddle 😏 Biggest "container" win you've had? #DSA #LeetCode #CodingChallenge #ProblemSolving #LearningInPublic #CONNECT
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Day 20 #75DaysDSAChallenge 📚⚡ Balanced GFG: Allocate Min Pages (Binary on min-max: low=max book, high=total; mid feasibility check) 0.15s | 100% first-try — no student buried in tomes 😅. #DSA #CodingChallenge #BinarySearch #ProblemSolving #LearningInPublic #CONNECT
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