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Contents
module difference_of_squares;
import std.range : iota;
import std.algorithm : sum, map;
struct Squares {
this(uint max) pure {
end = max + 1;
}
@property uint squareOfSum() const pure {
return iota(end).sum ^^ 2;
}
@property uint sumOfSquares() const pure {
return iota(end).map!"a ^^ 2".sum;
}
@property uint difference() const pure {
return squareOfSum - sumOfSquares;
}
private uint end;
}
Squares squares(uint max) pure {
return Squares(max);
}
unittest {
assert(squares(5).squareOfSum == 225);
assert(squares(10).squareOfSum == 3_025);
assert(squares(100).squareOfSum == 25_502_500);
assert(squares(5).sumOfSquares == 55);
assert(squares(10).sumOfSquares == 385);
assert(squares(100).sumOfSquares == 338_350);
assert(squares(0).difference == 0);
assert(squares(5).difference == 170);
assert(squares(10).difference == 2_640);
assert(squares(100).difference == 25_164_150);
}
Version data entries
213 entries across 213 versions & 1 rubygems