Since you were informed less than one week beforehand and departed more than one hour earlier and arrived less than four hours later than scheduled then you are entitled to 50% of the compensation amount.

When a flight is cancelled less than a week beforehand and the rerouting results in a departure of more than one hour earlier, under the regulation, exemptions under 5(1)c(i/ii/iii) can not apply. With that earlier departure, other than possibly reducing compensation by 50% (Article 7.2), it does not matter what eventual delay in arrival occurs, if any, in relation to compensation being payable or not.