(python-codefoces)Codeforces Round #540 (Div. 3) A. Water Buying
https://codeforces.com/contest/1118/problem/A
python代码:
import math
q=int(input())
for i in range(q):
n,a,b=map(int,input().split())
z=(math.floor(n/2)*min(2*a,b)+(n%2)*a)
print(z)