Computations Modulo P in Competitive Programming
Tutorial for beginners on computations modulo P in competitive programming. In so many Codeforces problems, we need to print the answer modulo M, most often M=10^9+7. What's the reason for that and how should it affect your code? Why modular subtraction is tricky and division even more difficult (modular inverse uses this https://en.wikipedia.org/wiki/Euler%2... Watch the video, then solve introductory problems here https://cses.fi/problemset/ and read Competitive Programmer's Handbook for some structured knowledge https://cses.fi/book/book.pdf
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