hi all

i need help in doing this problem,

Let $\displaystyle f_{n}, f$ be integrable functions and $\displaystyle f_{n} \to f$ a.e.

show that $\displaystyle \int |f_{n} - f| \to 0$ if and only if $\displaystyle \int |f_{n}| \to \int |f|$

i don't know where should i start.

any hint would be greatly appreciated