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Chiaki has n intervals and the i-th of them is [li, ri]. She wants to delete some intervals so that there does not exist three intervals a, b and c such that a intersects with b, b intersects with c a...

John Doe has recently found a "Free Market" in his city — that is the place where you can exchange some of your possessions for other things for free. John knows that his city has n items in total (ea...

There are lots of number games for children. These games are pretty easy to play but not so easy tomake. We will discuss about an interesting game here. Each player will be givenNpositive integ...