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• OJ

  1. CodeForces
  2. TopCoder
  3. LightOJ
  4. CodeChef
  5. AtCoder
  6. Toph
  7. UVA

• Language

  1. C
  2. C++
  3. C#
  4. Java
  5. Python3

• Notes

  1. Editorials
  2. Tutorials