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iOS Solution: Tower Defense Game

I solved problem following way. Can someone confirm if my version is correct?

Tower Defense Game

let towerX = 2.0 let towerY = 13.0

let enemyX = 4.0 let enemyY = 9.0

let distanceX = (towerX - enemyX) * (towerX - enemyX) let distanceY = (towerY - enemyY) * (towerY - enemyY)

let distance = distanceX + distanceY

let root = sqrt(distance)