给定一个数组,将数组中的元素向右移动 k 个位置,其中 k 是非负数。
示例 1:
输入: [1,2,3,4,5,6,7] 和 k = 3输出: [5,6,7,1,2,3,4]解释:向右旋转 1 步: [7,1,2,3,4,5,6]向右旋转 2 步: [6,7,1,2,3,4,5]向右旋转 3 步: [5,6,7,1,2,3,4]
示例 2:
输入: [-1,-100,3,99] 和 k = 2输出: [3,99,-1,-100]解释: 向右旋转 1 步: [99,-1,-100,3] 向右旋转 2 步: [3,99,-1,-100]
public void Rotate(int[] nums, int k) { int len = nums.Length; int temp = nums[0]; int index = 0; int targetIndex = 0; int startIndex = 0; for(int i = 0;i< len; i++) { targetIndex = (index + k) % len; //交换这两个数 temp = temp + nums[targetIndex]; nums[targetIndex] = temp - nums[targetIndex]; temp = temp - nums[targetIndex]; index = targetIndex; if(index == startIndex) { //转回到了原点,将指标往下指 index = (index+1)%len; startIndex = index; temp = nums[index]; } } }