Challenging Problems from CodeChef & CodeForces

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Help me listing the most challenging problems form CodeChef & CodeForces. I will be adding some from myself too.

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HackerEarth, Topcoder and other Competitive Programming sites are welcomed too.

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aim_ioi

It depends on your current level. Try out difficult section on codechef and div1 problems in codeforces.

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@pratik_gadhiya but still it would be nice if the problems are suggested from Best coders or the problems which are really tricky.

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I think the most tricky…

1.BASE

2.KIRLAB.

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Check out this profiles on codechef for challanging problems solved by them. This would help you out.

@rajat1603 (Represented India in IOI 2016)

@sumeet_varma (One of the best in this sport!)

@pulkit (One more!)

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