Created
September 12, 2023 10:34
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//необходимо реализовать функцию позволяющую делать сдвиг массива | |
//@param swift - любое целочисленное число | |
//@param arr - любой целочисленный массив | |
//func arrayShift(_ arr: [Int], swift: Int) -> [Int] | |
//пример 1 | |
//arrayShift([1,2,3,4,5], shift: 1) | |
//result : [5,1,2,3,4] | |
//пример 2 | |
//arrayShift([1,2,3,4,5], shift: 2) | |
//result : [4,5,1,2,3] | |
func arrayShift(_ input: [Int], shift: Int) -> [Int] { | |
guard !input.isEmpty, shift != 0 else { | |
return input | |
} | |
guard input.count != shift else { | |
return input | |
} | |
let isSuffix = shift > 0 | |
var count = abs(shift) | |
if count > input.count { | |
count = count % input.count | |
} | |
var output = input | |
if isSuffix { | |
var suffix = output.suffix(count) | |
output.removeLast(count) | |
return suffix + output | |
} else { | |
var output = input | |
var prefix = output.prefix(count) | |
output.removeFirst(count) | |
return output + prefix | |
} | |
} | |
let r1 = arrayShift([1,2,3,4,5], shift: 1) | |
let r2 = arrayShift([1,2,3,4,5], shift: 2) | |
let r3 = arrayShift([1,2,3,4,5], shift: 11) | |
let r4 = arrayShift([], shift: 11) | |
let r5 = arrayShift([1,2,3,4,5], shift: 0) | |
let r6 = arrayShift([1,2,3,4,5], shift: -1) |
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