Good website/resource for competitive programming.

Which website/resource are good for competitive programming ?

use topcoder tutorials and Introduction to Algo by Thomas Cormen … really useful

Sites to practice solving problems:

TopCoder

Codechef

Codeforces

SPOJ

Hackerrank

Hackerearth

UVA OJ

Books:

CLRS (Introduction to Algorithms)

U. Vazirani (Algorithms)

Programming Challenges (Skiena)

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