Problem link
I could not think of any approach but just am getting an intuition of using DSU in reverse or querying offline but I can't think of anything. Someone please help.
I just need an approach not complete code.:)
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| Rev. | Lang. | By | When | Δ | Comment | |
|---|---|---|---|---|---|---|
| en2 |
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aman_naughty | 2019-10-15 08:48:42 | 71 | ||
| en1 |
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aman_naughty | 2019-10-15 08:45:18 | 278 | Initial revision (published) |
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