移动零

 

 

class Solution {
    public void moveZeroes(int[] nums) {
        int result=0 ;
        for(int i =0 ;i < nums.length;i ++){
            if(nums[i]!= 0){
                nums[result++] = nums[i];
            }
        }
        while (result < nums.length){
            nums[result++] = 0 ;
        }
    }
}

二、第一个错误版本

 

 

package my;

public class FirstBadVersionSolution {
    public int firstBadVersion(int n){
        int low = 1;
        int high = n;
        while(low < high){
            int middle = low + (high - low)/2 ;
            if(isBadVersion(middle)){
                high = middle;
            }else{
                low = middle +1;
            }
        }
        return low;
    }
    //随便实现一个
    boolean isBadVersion(int version){
        if(version == 4){
            return true;
        }else{
            return false;
        }
    }
}

三、Nim Game

 

 

class Solution {
    public boolean canWinNim(int n) {
        if(n % 4 ==0){
            return false ;
        }else{
            return true ;
        }

    }
}