Deltix Round, Summer 2021 (Div.1 + Div.2) Posted on 2021-08-30 Edited on 2022-02-24 In CodeForces Deltix Round, Summer 2021 (Div.1 + Div.2) Problem - D - Codeforces key inspection: \[ a\ \mathrm{and}\ b + a\ \mathrm{\text or}\ b = a + b \]