Solution Set -「CF 1539」
				我是傻逼。「CF 1539A」Contest StartLink.答案是 $\sum_{i=1}^{n-1}\min\{i,\lfloor\frac{t}{x}\rfloor\}$,等差数列求和...            
		In mathematics you don't understand things, you just get used to them.
In mathematics you don't understand things, you just get used to them.