For the 11th grade high school students applying to top 50 US universities

Here are 15 coding competitions that 11th grade high school students could participate in as a high school activity to enhance their college applications:

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Easy:

1. Code.org Hour of Code

2. Code Combat

3. Codewars

4. Codeacademy

5. HackerRank Junior

6. Scratch Programming

7. CoderZ

8. Topcoder Beginner Track

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Intermediate:

1. Google Code-in

2. Microsoft Imagine Cup

3. ACM International Collegiate Programming Contest

4. CodeForces

5. Google Code Jam

6. Project Euler

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Difficult:

1. 1. Facebook Hacker Cup

2. 2. Google KickStart

3. 3. Topcoder Open

4. 4. The International Olympiad in Informatics (IOI)

5. 5. The USA Computing Olympiad (USACO)

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Please note that these competitions are not ranked in any order, and difficulty level is subjective and can vary for different participants.