Can you please suggest problems which are based on segments, intervals, line sweep (for intervals etc), like this one. How to find such problems on codeforces or other judges? Thanks!
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try these problems
https://mirror.codeforces.com/contest/1424/problem/G
https://mirror.codeforces.com/contest/1420/problem/D
https://mirror.codeforces.com/contest/1249/problem/D2
https://mirror.codeforces.com/contest/845/problem/C