[Swift]LeetCode1151. 最少交换次数来组合所有的 1 | Minimum Swaps to Group All 1's Together
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Given a binary array data
, return the minimum number of swaps required to group all 1
’s present in the array together in any place in the array.
Example 1:
Input: [1,0,1,0,1]
Output: 1
Explanation:
There are 3 ways to group all 1's together:
[1,1,1,0,0] using 1 swap.
[0,1,1,1,0] using 2 swaps.
[0,0,1,1,1] using 1 swap.
The minimum is 1.
Example 2:
Input: [0,0,0,1,0]
Output: 0
Explanation:
Since there is only one 1 in the array, no swaps needed.
Example 3:
Input: [1,0,1,0,1,0,0,1,1,0,1]
Output: 3
Explanation:
One possible solution that uses 3 swaps is [0,0,0,0,0,1,1,1,1,1,1].
Note:
1 <= data.length <= 10^5
0 <= data[i] <= 1
给出一个二进制数组 data
,你需要通过交换位置,将数组中 任何位置 上的 1 组合到一起,并返回所有可能中所需 最少的交换次数。
示例 1:
输入:[1,0,1,0,1] 输出:1 解释: 有三种可能的方法可以把所有的 1 组合在一起: [1,1,1,0,0],交换 1 次; [0,1,1,1,0],交换 2 次; [0,0,1,1,1],交换 1 次。 所以最少的交换次数为 1。
示例 2:
输入:[0,0,0,1,0] 输出:0 解释: 由于数组中只有一个 1,所以不需要交换。
示例 3:
输入:[1,0,1,0,1,0,0,1,1,0,1] 输出:3 解释: 交换 3 次,一种可行的只用 3 次交换的解决方案是 [0,0,0,0,0,1,1,1,1,1,1]。
提示:
1 <= data.length <= 10^5
0 <= data[i] <= 1
820 ms
1 class Solution { 2 func minSwaps(_ data: [Int]) -> Int { 3 let n:Int = data.count 4 var s:[Int] = [Int](repeating:0,count:n+1) 5 for i in 1...n 6 { 7 s[i] = s[i-1] + data[i-1] 8 } 9 var m:Int = s[n] 10 var ret:Int = n 11 for i in m...n 12 { 13 ret = min(ret, m-(s[i]-s[i-m])) 14 } 15 return ret 16 } 17 }