x and y. Return their sum.
This is a warm-up problem: a handy way to get to know the editor and the test runner.x=23, y=19 → 42
23 + 19 = 42.
x=-7, y=3 → -4
−7 + 3 = −4: the sum can be negative.
x, y ≤ 100x=23, y=19
42
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