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awesome-competitive-programming
:gem: A curated list of awesome Competitive Programming, Algorithm and Data Structure resources
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InfluxDB
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You need more than logic and practice. These contests are not just intelligence tests. They also test knowledge of certain algorithms, techniques, and mathematical skills. My suggestion would be to pick a problem from that contest and spend some time trying to solve it (no more than an hour or two even for harder problems). Then whether or not you solve it yourself, read an editorial or someone else's solution. Make a note of any concepts you're not familiar with, and read up on them. You should be able to find everything you need online, but https://github.com/lnishan/awesome-competitive-programming has other sources including books. Then solve the problem again and make sure you understand it. Once you do this enough times, you'll cover all the topics that are likely to come up in that contest.