Why math problem so hard

Revision en1, by lady__hunter, 2025-03-10 11:44:17

I can't think any idea when meet math problem (i.e : Problem D Div2... ). Can someone share me some tips or websites to read about them ?. Thank you.

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en1 English lady__hunter 2025-03-10 11:44:17 173 Initial revision (published)