数组 是否存在重复元素

数组中是否存在重复元素

Swift

let array: [Int] = [1,1,1,3,3,4,3,2,4,2]

for i in 0..<array.count {
    
    for j in (i+1)..<array.count {
    
        if (array[i] == array[j]) {
    
            print(true)
            return
        }
    }
}
print(false)

函数实现如下

func containsDuplicate(_ nums: [Int]) -> Bool {
    
    for i in 0..<nums.count {
    
        for j in (i+1)..<nums.count {
    
            if (nums[i] == nums[j]) {
    
                return true
            }
        }
    }
    return false
}

调试

let array: [Int] = [1,1,1,3,3,4,3,2,4,2]
let duplicate: Bool = containsDuplicate(array)
print(duplicate)