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Thanks for your reply,can u plz give me any idea about optimization.

On cgy4ever → Codeforces Round #270, 12 years ago
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On white_coder → Trie Tree, 13 years ago
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Thanks for reply,can u please explain how does it help to reduce memory.
On white_coder → segment tree problem., 13 years ago
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Thanks for your reply,can you tell me the O(n) solution with stack.