A PAIR of mind-boggling braniacs have done the 'impossible' and cracked the complex code that decorated one of Oxford's newest restaurants.

The newly refurbished Wagamama in George Street put out an appeal for people to take on a headache-inducing equation in celebration of Albert Einstein's birthday last month.

The first person to solve the puzzle could win six months worth of free food.

For the past month it has used its windows as a canvas for the 'impossible code' which was set by an Oxford University mathematician.

But the problem proved no match for one Oxford University academics and self-proclaimed riddle fanatics Klaudia Krawiecka and Vojtech Havlicek who took on the maths challenge over dinner.

The puzzle was as follows: Each number below encodes a letter of the alphabet. When you've worked out the letters, you'll need to unscramble them to make three topical words.

330 33 2 105 55 10 2 2 70 2 105 14 42 11 2 10 154 2 11 70 30 2 70

Ms Krawiecka said: "We were having dinner at Wagamama when we found out about the competition.

"We had some spare time while waiting for the food and decided to give it a shot as we both enjoy solving riddles.

"It was a collaborative effort between us both."

Ms Krawiecka, a graduate studying Cybersecurity, and Mr Havlicek, who is currently undertaking a DPhil in Quantum Computing, said maths and science to them is like their 'daily bread'.

So they set about solving the equation initially using frequency analysis, which failed. They then found a hint in the question and decomposed the numbers into primes. They used their knowledge to convert this into a five digit binary string -a sequence of 0's and 1's - converted this into ASCII computer codes and got the three words: Wagamama: Ramen: Teppanyaki

Mr Havlicek, who said Ms Krawiecka was a 'die-hard computer scientist' which helped in solving the final piece of the puzzle, said: "We solve riddles on daily basis both in personal and professional lives.

"It is our daily bread."

The pair of genius' won a £500 voucher for the restaurant chain for cracking the 'impossible code'.

Mr Haylicek added: "We will be well fed for a while!"

People were given one week to solve the puzzle before they had to submit the forms to the restaurant in George Street by March 21.

Mr Haylicek and Ms Krawiecka were the first to work out the answer.