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I think it is Codeforces Visualizer: https://cfviz.netlify.app/virtual-rating-change.html

cppreference has more content. Some newer stuff aren't present in cplusplus.

I solved it without using a stack or something similar. https://atcoder.jp/contests/abc328/submissions/47497326

My approach was to find each "ABC" and expand it to the left and right trying to find more prefixes and suffixes like "AB" with "C" and "A" with "BC". Then I remove the matched sub string [l, r] from S and continue the process from l.

On SecondThread → Hacker Cup Shirts 2023, 3 years ago
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I think the sizes in the chest width are divided by 2. So they are considering just one side of the chest width.

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