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![he most important DP pattern you'll ever learn. 0/1 Knapsack — every interview has a version of it. The recurrence is just two choices: Skip the item → dp[i][w] = dp[i-1][w] Include the item → dp[i][w](https://image.pictame.com/img/669898888_18044994104587857_3921722089787642932_n.jpg?hash=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)
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![Brute force checks every pair → O(n²). HashMap does it in O(n). The trick: Build freq map in one pass For each key, check if key + k exists in the map If yes → pairs += freq[key] × freq[key+k] That's](https://image.pictame.com/img/660978872_18042882596587857_1615295072721945166_n.jpg?hash=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)
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About @codearcdev
CodeArc is a Instagram growing creator in the Tech category. With 3 followers and 12 posts, codearcdev's account shows a follower-to-following ratio of 0.8:1. View all content anonymously on Pictame - no login required.
codearcdev's engagement rate sits at 72.22%. That's 1344% above what you'd typically see for accounts with 1K-10K followers (average 5%) — a sign of a genuinely connected audience.
Out of the last 12 posts, 100% are videos and 0% are photos. New posts appear roughly every 3 days — a steady, reliable rhythm. Captions lean detailed, averaging 766 characters.
72.22% engagement rate — 1344% above average for 1K-10K follower accounts.
New content every 3 days — a steady rhythm.
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