zoukankan      html  css  js  c++  java
  • 26. Remove Duplicates from Sorted Array

    Problem:

    Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length.

    Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

    Example 1:

    Given nums = [1,1,2],
    
    Your function should return length = 2, with the first two elements of nums being 1 and 2 respectively.
    
    It doesn't matter what you leave beyond the returned length.
    

    Example 2:

    Given nums = [0,0,1,1,1,2,2,3,3,4],
    
    Your function should return length = 5, with the first five elements of nums being modified to 0, 1, 2, 3, and 4 respectively.
    
    It doesn't matter what values are set beyond the returned length.
    

    Clarification:

    Confused why the returned value is an integer but your answer is an array?
    
    Note that the input array is passed in by reference, which means modification to the input array will be known to the caller as well.
    
    Internally you can think of this:
    
    // nums is passed in by reference. (i.e., without making a copy)
    int len = removeDuplicates(nums);
    
    // any modification to nums in your function would be known by the caller.
    // using the length returned by your function, it prints the first len elements.
    for (int i = 0; i < len; i++) {
        print(nums[i]);
    }
    

    思路

    Solution (C++):

    int removeDuplicates(vector<int>& nums) {
        if (nums.empty()) return 0;
        int dup_count = 0, res = 1, i = 0, n = nums.size();
        while (i < n -1) {
            while (i < n - 1 && nums[i] == nums[i+1]) { ++i; dup_count += 1; }
            if (i == n - 1) return res;
            ++i;
            ++res;
            nums[i-dup_count] = nums[i];
        }
        return res;
    }
    

    性能

    Runtime: ms  Memory Usage: MB

    思路

    Solution (C++):

    
    

    性能

    Runtime: ms  Memory Usage: MB

    相关链接如下:

    知乎:littledy

    欢迎关注个人微信公众号:小邓杂谈,扫描下方二维码即可

    作者:littledy
    本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文链接,否则保留追究法律责任的权利。
  • 相关阅读:
    Mysql权限控制
    Linux查看端口
    linus 下redis守护进程启动
    pymongo创建索引
    mongo批量操作存在更新否则插入
    梯度下降推导过程资料整理
    [转]mitmproxy套件使用攻略及定制化开发
    终极利器!利用appium和mitmproxy登录获取cookies
    how-to-pass-a-class-variable-to-a-decorator-inside-class-definition
    python进阶之魔法函数
  • 原文地址:https://www.cnblogs.com/dysjtu1995/p/12571617.html
Copyright © 2011-2022 走看看