这个真的不知道应该用高精还是FFT，所以...
~~来介绍几种自带高精的语言~~
Python3:
```python
n = int(input())
for i in range(0, n):
s = input().split()
print (int(s[0]) * int(s[1]))
```
Python2:
```python
n = int(raw_input())
for i in range(0, n):
s = raw_input().split()
print int(s[0]) * int(s[1])
```
Ruby:
```ruby
n = gets.to_i
for i in 1..n do
a, b = gets.split
a, b = a.to_i, b.to_i
puts a * b
end
```