weixin_41157881-CSDN博客

原创 memset和sprintf小记

#include#include#includeusing namespace std;struct Test{string a;string b;};int main(){Test ta{“123”,“abc”};cout << ta.a << " " << ta.b << endl;memset(&ta, 0, ...

2019-12-30 22:23:46 397

原创类的继承的实例

#include#include#include#include #include #includeusing namespace std;class Base{public:virtual void display() = 0;};class A :public Base{public:void display(){cout << “A class”...

2019-12-30 22:21:28 229

原创 N个括号有多少种合法的组合

两种算法，思想都是左括号始终大于等于右括号，当左括号等于右括号的时候且等于N的时候。记录为1#include#include#include#include #include #include#includeusing namespace std;void display(int x, int y){cout << x << " " << ...

2019-12-12 22:13:10 665

原创 C++11的一种多线程安全的单例模式

#include #include using namespace std;class Test{public:Test(){cout << “create Test class” << endl;num++;cout << “create Test class finish” << endl;}void ttt(){st...

2019-12-11 23:20:36 225

原创 C++访问控制

#includeusing namespace std;class base{public:int a = 555;private:int b = 666;protected:int c = 777;};class publicTest :public base{public:void fun(){cout << "publicTest: ";cout...

2019-12-09 22:42:03 109

原创类中的枚举变量

#includeusing namespace std;class A{public:enum Test{ONE,TWO,THREE};};int main(){cout << sizeof(A) << endl;//枚举变量不占用类的空间A::Test b = A::TWO;cout << int(b) << end...

2019-11-27 20:55:03 384 1

原创 c++14 lambdas新特性

#include #include using namespace std;int main(){std::unique_ptr<int> p(new int);int x = 5;*p = 11;auto y = [p = std::move(p)]() { std::cout << "inside: " << *p << "\n"...

2019-11-26 23:18:23 100

原创智能指针的使用

#include#include#include#includeusing namespace std;class SreBob{public:SreBob();SreBob(initializer_list il);//大括号初始化的调用的函数int size()const { return data->size(); }bool empty()const { ret...

2019-11-25 21:28:00 85

原创 C++重载

#includeusing namespace std;int maxt(int a, int b){if (a > b){return a;}return b;}int maxt(int a, int b,int c){if (a > b && a > c){return a;}else if (b > a &&am...

2019-11-24 21:34:45 87

原创智能指针实现单链表

#include#include#include#includeusing namespace std;struct LinkNode;using sharedPtr = std::shared_ptr;struct LinkNode{int val;sharedPtr next;};class LinkList{private:int length;sharedP...

2019-11-23 22:29:16 328

原创定时器的实现

#include#include#include#includeusing namespace std;#define MSOFDAY (246060*1000UL)void func(char str[100]){cout << sizeof(str) << endl;}class Timer{public:void fun(int num, s...

2019-11-19 23:39:31 141

原创 C++模板编程新的小特点

#includeusing namespace std;template<int *p>struct wrapper{int get() { return *p; }void set(int v) { *p = v; }};template<int &p>struct wrapper1{int get() { return p; }void ...

2019-11-16 22:45:41 85

原创一系列测试题目

#includeusing namespace std;void Foo(char str1[100]){cout << "sizeof(str) = " << sizeof(str1) << endl;}void GetM1(char *p){p = (char *)malloc(100);}void test1(void){char ...

2019-11-13 22:30:31 168

原创一系列小的题目

#include#includeusing namespace std;class A{public:virtual void f() = 0;};class B :virtual public A{public:void f(){cout << “B” << endl;}};class C :virtual public A{publi...

2019-11-11 21:51:03 106

原创一系列小的题目

#include#include#include#include #include #include#include#includeusing namespace std;class A{public:A() :c(3), b©, a(b) {}public:int a;int b;int c;};class MyString{public:explici...

2019-11-09 23:24:05 96

原创 const_cast、static_cast、dynamic_cast总结实例

#include#include#include#include #include using namespace std;struct SA{int i;};enum enumtest{A=1,B};class Base{public:int m;virtual void fun(){}};class Dclass :public Base{pub...

2019-11-06 22:04:17 76

原创一系列自测题目

#include#include#include#includeusing namespace std;class A{private:A(){cout << “create A” << endl;}int a1 = 100;static A a;static std::mutex mtx;public:static A getA(){i...

2019-11-05 23:02:17 88

原创一系列题目自检

#include#include#include#include#includeusing namespace std;struct LinkNode{int val;LinkNode *next;LinkNode(int val, LinkNode *next = nullptr){this->val = val;this->next = next;}}...

2019-11-04 23:24:18 150

原创信号量的实现和使用

#include#include#include<condition_variable>#include#includeusing namespace std;class Semaphore{public:explicit Semaphore(unsigned int count);~Semaphore();public:void wait();void si...

2019-09-29 00:30:47 204

原创 [LeetCode] 905. Sort Array By Parity 按奇偶排序数组

前后指针操作即可。#include#includeusing namespace std;void SortArrayByParity(vector &vec){int left = 0;int right = vec.size() - 1;while (left < right){while (left < right && vec[lef...

2019-09-27 00:01:16 113

原创 C++11信号量

信号量我感觉可以实现线程之间传递和唤醒。很有意思的一种线程实现和线程同步。#include#include#include#include<condition_variable>using namespace std;class semaphone{public:semaphone(unsigned int count) :count(count) {}void w...

2019-09-24 23:13:06 478

原创 [LeetCode] Valid Palindrome 验证回文字符串

#include#includeusing namespace std;bool isZimu(char ch){if (ch >= ‘a’ && ch <= ‘z’ || ch >= ‘A’ && ch <= ‘Z’){return true;}else{return false;}}bool ValidPali...

2019-09-23 23:14:18 76

原创 [LeetCode] 252. Meeting Rooms 会议室

不是很难#include#include #includeusing namespace std;bool MeetingRooms(vector<std::pair<int, int>> &vec){sort(vec.begin(), vec.end(), [](std::pair<int, int> x, std::pair<in...

2019-09-20 23:59:48 140

原创 [LeetCode] 209. Minimum Size Subarray Sum 最短子数组之和

左右指针的想法用的好多啊#include#includeusing namespace std;int maxt(int a, int b){if (a > b){return a;}return b;}int mint(int a, int b){if (a < b){return a;}return b;}int MinimumSize...

2019-09-19 23:10:16 74

原创 [LeetCode] 137. Single Number II 单独的数字之二

1.位运算很巧妙的应用啊。#include#includeusing namespace std;int SingleNumberII(vector &vec){int res = 0;for (int i = 0; i < 32; i++){int sum = 0;for (int j = 0; j < vec.size(); j++){sum += ...

2019-09-18 23:32:51 113

原创 [LeetCode] 222. Count Complete Tree Nodes 求完全二叉树的节点个数

需要对于完全二叉树和满二叉树的概念和性质很熟悉#include#include#includeusing namespace std;struct TreeNode{int val;TreeNode lChild;TreeNode rChild;TreeNode(int val, TreeNodel = nullptr, TreeNoder = nullptr){t...

2019-09-17 22:44:01 76

原创 c语言结构体的比较

只判断是否相等，不比较大小有时候我们需要知道比较结构体的某一部分，以便做进一步处理。这就需要我们在比较的时候做一些结构体的地址的偏移和比较。我们通过比较test的fileds的是否相等，来进行下一步操作。#include<stdio.h>struct fileds{int a;int b;int c;};struct data{int user;int mask...

2019-09-16 22:28:28 6654

原创 [LeetCode] Trapping Rain Water 收集雨水

能收集雨水的地方肯定是两边都比他高的地方#include#includeusing namespace std;int maxt(int a, int b){if (a > b){return a;}return b;}int mint(int a, int b){if (a < b){return a;}return b;}int Trappi...

2019-09-15 21:36:13 55

原创 [LeetCode] Trapping Rain Water 收集雨水

好难的一道题目啊，不看图片不知道什么意思#include#includeusing namespace std;int maxt(int a, int b){if (a > b){return a;}return b;}int mint(int a, int b){if (a < b){return a;}return b;}int Tr...

2019-09-14 23:27:56 62

原创 159. Longest Substring with At Most Two Distinct Characters 最多有两个不同字符的最长子串

#include#include<unordered_map>#includeusing namespace std;int maxt(int a, int b){if (a > b){return a;}return b;}int LongestSubstringTwoDistinctCharacters(string str){int res = ...

2019-09-14 00:22:59 55

原创 [LeetCode] Strobogrammatic Number 对称数

不是很难的一道题目#include#includeusing namespace std;bool StrobogrammaticNumber(string str){int n = str.size() - 1;int i = 0;while (i < n){if (str[i] == str[n]){if (str[i] != ‘1’ && st...

2019-09-12 23:45:00 67

原创 235. Lowest Common Ancestor of a Binary Search Tree 二叉搜索树的最小共同父节点

按照二叉树的性质遍历即可#includeusing namespace std;struct TreeNode{int val;TreeNode lChild;TreeNode rChild;TreeNode(int val, TreeNodel = nullptr, TreeNoder = nullptr){this->val = val;this->l...

2019-09-11 23:19:05 63

原创 [LeetCode] 72. Edit Distance 编辑距离

#include#includeusing namespace std;int minT(int a, int b){if (a < b){return a;}return b;}int EditDistanceT(string word1, int i,int lenn, string word2, int j,int lenm){if (i == lenn){...

2019-09-10 22:41:10 75

原创 [LeetCode] Binary Tree Right Side View 二叉树的右侧视图

树的层次遍历的思路来解决#include#include#includeusing namespace std;struct TreeNode{int val;TreeNode lChild;TreeNode rChild;TreeNode(int val, TreeNodel = nullptr, TreeNoder = nullptr){this->val...

2019-09-09 22:47:46 47

原创非递归实现二叉树的后序遍历

#include#includeusing namespace std;struct TreeNode{int val;TreeNode lChild;TreeNode rChild;TreeNode(int val, TreeNodel = nullptr, TreeNoder = nullptr){this->val = val;this->lChild ...

2019-09-07 23:56:44 70

原创很有意思的一段代码

#include<stdio.h>typedef int(*func)(int, int);int minT(int a, int b){return a < b ? a : b;}int maxT(int a, int b){return a > b ? a : b;}int sum(int a, int b){return a + b;}s...

2019-09-05 22:41:09 221

原创 [LeetCode] 214. Shortest Palindrome 最短回文串

#include#includeusing namespace std;string ShortestPalindrome(string str){string t = str;reverse(t.begin(), t.end());int n = t.size(),i=0;for (i = n; i >= 0; i–){if (str.substr(0, i) == ...

2019-09-03 22:57:52 100

原创 [LeetCode] Binary Tree Postorder Traversal 二叉树的后序遍历

二叉树的后序遍历的非递归实现（肯定要用栈）先序遍历顺序root->left->right后续遍历顺序left->right->root我们在先序遍历的的非递归实现的时候变为root->right->left，然后在翻转即可或者插入的时候做相关的操作也可以。#include#include#includeusing namespace...

2019-09-01 00:08:55 65

原创一道有意思的多线程题目

#include#include#include#include<condition_variable>using namespace std;int num = 3;std::mutex mtx;std::condition_variable con;void test(int flag){unique_lockstd::mutex lk(mtx);whil...

2019-08-30 23:54:21 95

原创 30. Substring with Concatenation of All Words 串联所有单词的子串

#include#include#include#include<unordered_map>using namespace std;vector getlen(string s, vector &vec){vector res;unordered_map<string, int> mapstr;for (auto x : vec){ma...

2019-08-28 23:18:40 56

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