Leetcode some common functions

The swap function of the 1,java. Exchange

Public static void swap ( int [] data, int A, int b) {

int t = data [a];

data [A] = data [b];

data [b] = t;

}

2, move the array K-bit to the right (rotate array);

public class Solution {
public void rotate (int[] nums, int k) {
if (nums.length <= 1) {
Return
}
Step each time to move
int step = k% Nums.length;
Reverse (nums,0,nums.length-1);//Put to the end to move to the left
Reverse (nums,step,nums.length-1);
Reverse (nums,0,step-1);


}

reverse int array from N to M
public void reverse (int[] nums, int n, int m) {
while (n < m) {
Nums[n] ^= nums[m];
NUMS[M] ^= Nums[n];
Nums[n] ^= nums[m];
n++;
m--;
}
}
}

3,

Leetcode some common functions