Coding Challenge November 2019 For Students @Chiang Mai

Coding Instructions:
The following German words represent a mathematical formula:
HIER + GIBT + ES = NEUES

Conditions:
– every letter symbolizes one digit [0..9]
– the 10 different letters have to be 10 different digits
– every word is an unsigned integer number (no leading zeros)

Challenge:
– create a PHP class containing a private method that solves the problem mentioned
– “worst case” solution: brute force (10¹⁰ iterations = 10,000,000,000 iterations)
– “best case” solution: use mathematical rules to reduce the amount of iterations of the problem (“if then continue”)
– use a counter variable to measure the amount of loops needed to find possible results

$iterations = 0;
[loops to assign digits to the letters]
    e.g.: H=9;I=8;E=7;R=6;G=5;B=4;T=3;S=2;N=1;U=0
    9876 + 5843 + 72 !== 17072  // not a correct solution
    $iterations++
[/loops]

– the method should output all results – if there are any – including the amount if iterations needed
– use comments to describe the mathematical rules used to reduce the complexity of the task
– the first place goes to the correct solution having the least iterations

Our Prizes:
1^st Prize: Gift Voucher ฿1,000.00 (Central Voucher or Major Voucher or Starbucks Voucher)
2^nd till 4^th Prize: Gift Voucher ฿750.00 (Central Voucher or Major Voucher or Starbucks Voucher)
5^th till 10^th Prize: Starbucks Voucher ฿300.00

Please send your answer and attached PHP file with a copy of your student ID and mobile phone number for reference via email to: info@data-horizon.com

Competition closes on the 1^st of December 2019. The winners will be announced on 2^nd of December 2019.