📚 Materials:
https://youkn0wwho.academy/topic-list
P1: https://codeforces.com/contest/1916/problem/B
S1: https://ideone.com/Qik6Wo
P2: https://vjudge.net/problem/EOlymp-9606
S2: https://vjudge.net/solution/69136989/6kQRDvPkOsKhxvgb8VM3
P3: https://cses.fi/problemset/task/1712/
S3: https://ideone.com/cFO44O
P4: https://cses.fi/problemset/task/1079/
S4: https://ideone.com/xY9xra
P5: https://cses.fi/problemset/task/1715/
S5: https://ideone.com/XqWVqf
⏱️ Timestamps:
0:00 GCD
12:43 LCM
14:12 Problem 1
31:45 Modular inverse
45:13 Problem 2
50:49 Problem 3
1:07:55 Basic counting
1:20:37 Problem 4
1:22:03 Problem 5
