Codeforces Round #691 (Div. 1) B. Glass Half Spilled ±³°üDP

B. Glass Half Spilled There are 𝑛 glasses on the table numbered 1,¡­,𝑛. The glass 𝑖 can hold up to 𝑎𝑖 units of water, and currently contains 𝑏𝑖