if x = 4, the solution will be: y = 1^2+2^2+3^2+4^2=1+4+9+16 = 30.
Swap the first and last columns
Set the array elements whose value is 13 to 0
MATCH THE STRINGS (2 CHAR) very easy
How many jokers?
Side of an equilateral triangle
sum all digits
No more zeros
concatenate the elements
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