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  • 1004. Max Consecutive Ones III

    Given an array A of 0s and 1s, we may change up to K values from 0 to 1.

    Return the length of the longest (contiguous) subarray that contains only 1s. 

    Example 1:

    Input: A = [1,1,1,0,0,0,1,1,1,1,0], K = 2
    Output: 6
    Explanation: 
    [1,1,1,0,0,1,1,1,1,1,1]
    Bolded numbers were flipped from 0 to 1.  The longest subarray is underlined.

    Example 2:

    Input: A = [0,0,1,1,0,0,1,1,1,0,1,1,0,0,0,1,1,1,1], K = 3
    Output: 10
    Explanation: 
    [0,0,1,1,1,1,1,1,1,1,1,1,0,0,0,1,1,1,1]
    Bolded numbers were flipped from 0 to 1.  The longest subarray is underlined.
    

    Note:

    1. 1 <= A.length <= 20000
    2. 0 <= K <= A.length
    3. A[i] is 0 or 1 

    sliding window

    time = O(n), space = O(1)

    class Solution {
        public int longestOnes(int[] A, int K) {
            if(A == null || A.length == 0) {
                return 0;
            }
            int s = 0, f = 0, numOfZero = 0, max = 0;
            while(f < A.length) {
                if(A[f++] == 0) {
                    numOfZero++;
                }
                while(numOfZero > K) {
                    if(A[s++] == 0) {
                        numOfZero--;
                    }
                }
                max = Math.max(max, f - s);
            }
            return max;
        }
    }
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  • 原文地址:https://www.cnblogs.com/fatttcat/p/11374942.html
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