算法总结之 未排序正数数组中累加和为给定值的最长子数组长度

package TT;

public class Test70 {

    public static int getMaxLength(int[] arr, int k){
        if(arr==null || arr.length==0 || k<0){
            return 0;
        }
        
        int left =0;
        int right = 0;
        int sum = arr[0];
        int len = 0;
        while(right < arr.length){
            
            if(sum ==k){
                len = Math.max(len, right-left+1);
                sum -= arr[left++];
            }else if(sum <k) {
                right++;
                if(right== arr.length){
                    break;
                }
                sum +=arr[right];
            }else {
                sum -= arr[left];
            }
            
            
        }
        
        return len;
    }
    
    public static void main(String[] args){
        
        int[] arr = new int[5];
        arr[0]=1;
        arr[1]=2;
        arr[2]=1;
        arr[3]=1;
        arr[4]=1;
        
        int x =  getMaxLength(arr,3);
        System.out.println(x);
        
        
        
    }
    
    
    
    
}