Rotate Array
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Rotate an array of n elements to the right by k steps.
For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7]
is rotated to [5,6,7,1,2,3,4]
.
Note:
Try to come up as many solutions as you can, there are at least 3 different ways to solve this problem.
解法: 以后K位为第二部分,翻转前一部分,翻转后一部分,再整体翻转。
public class Solution {
public void rotate(int[] nums, int k) {int n = nums.length;
if( n<=0||k<=0) return;
k = (int) k%n;
// first part
for(int i = 0; i< (n-k)/2 ; i++){
swap(nums,i,n-k-1-i); // 以前写的是 swap(nums[x],nums[y]) 此为值传递,应该为引用传递
}
// second part
for(int j = n-k; j<k/2 +n-k; j++){
swap(nums,j,n-1-j+n-k);
}
// integrate
for(int t =0; t< n/2 ; t++){
swap(nums,t,n-t-1);
}
}
public void swap(int[] n, int x, int y){
int tmp = n[x];
n[x] = n[y];
n[y] = tmp;
}
}
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