codeforces all educational rounds
s = s.substr(0, l)
+ s.substr(r - k + 1, k) + s.substr(l, r - l + 1 - k)
+ s.substr(r + 1);codeforces all educational rounds
s = s.substr(0, l)
+ s.substr(r - k + 1, k) + s.substr(l, r - l + 1 - k)
+ s.substr(r + 1);Copyright © 2021 Codeinu
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