Update problem-sets-competitive-programming.md (#6042)

b6c0a460 · Raiyan Bashir Mahin · GitHub · d16a42a1 · b6c0a460
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more/problem-sets-competitive-programming.md more/problem-sets-competitive-programming.md +1 -0

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 * [Just another Golf Coding](http://jagc.org)
 * [Kattis](https://open.kattis.com)
 * [LeetCode](https://leetcode.com)
+* [LightOJ](https://lightoj.com)
 * [Microcorruption](https://microcorruption.com/login)
 * [oj.uz](https://oj.uz)
 * [Sphere Online Judge](http://www.spoj.com/contests)