Xurui_Luo的博客

遍历for(auto& e: memo) cout<<e.first<<endl;排序大到小自定义结构体#include <map> #include <string>#include <iostream>using namespace std; int main(){map<string, int, greater<string>> student;mapStudent [ ".

正确char a[] = "123";string obj_str;obj_str = a;-错误- 二三行不能直接写char a[] = "123";string obj_str = a;

class Solution {public: vector<vector<int>> intervalIntersection(vector<vector<int>>& A, vector<vector<int>>& B) { int i=0, j=0; vector<vector<int>> res; while(i<A.size

vector 最后一个元素vector.back()vector.rbegin()

肯定碰到分母为0了

vector<vector<int>> vec={ {0, 1, 2, 3} , /* 初始化索引号为 0 的行 */ {4, 5, 6, 7} , /* 初始化索引号为 1 的行 */ {8, 9, 10, 11} /* 初始化索引号为 2 的行 */ };int row = vec.size();int col = vec[[0].size();...

#include <iostream>#include <cstring>using namespace std;int main(){ string s = ""; char a = '1'; // 指定位置插入元素 s.insert(0, 1, a); s.insert(0, 1, '1'); s.insert(0, 1, '0'); cout<<s<<endl; // 011

terminate called after throwing an instance of 'std::logic_error' what(): basic_string::_M_construct null not valid空指针可能某个类型有问题，比如让你return string类型，结果返回成了inte.g. return “0”; 写成了 return 0;...

#include <iostream>#include <vector>using namespace std;// 注意这里在参数中，vector是引用，因此在该函数内，可以直接对main函数中的数组进行修改void swap(vector<int>& v, int i, int j){ int tmp = v[i]; v[i] = v[j]; v[j] = tmp;}int main(){ vector&l

输入是vector<string>& ss.empty() || s[0].empty()vector<vector<int>> qq.empty() || q[0].empty()

在CMakeLists.txt文件中添加如下即可，记得要重新载入# 遍历项目根目录下所有的 .cpp 文件file (GLOB_RECURSE files *.cpp)foreach (file ${files})string(REGEX REPLACE ".+/(.+)\\..*" "\\1" exe ${file})add_executable (${exe} ${file})message (\ \ \ \ --\ src/${exe}.cpp\ will\ be\ compiled\.

// C++ code to demonstrate sorting of a // 2D vector on basis of a column #include<iostream> #include<vector> // for 2D vector #include<algorithm> // for sort() using namespace std; // Driver function to sort the 2D vector // on

例子vector<vector<int>> vec;vec.resize(a, vector<int>(b,0); //初始化为0代码中的应用一般在私有变量中声明，在主函数中resize，这样在私有函数中就可以直接使用了class Solution {public: int superEggDrop(int K, int N) { memo.resize(K+5, vector<int>(N+5, 0));

输入#include <iostream> #include <vector> // for 2D vector using namespace std; int main() { // Initializing 2D vector "vect" with // different number of values in each // row. vector<vector<int> > vect{ {

完整错误: error: cannot deduce type of initializer list because std::initializer_list was not found; include<initializer_list>问题发现在list上, 如:#include <iostream>using namespace std;int main(){ for(auto k: {1, 2, 3}) cout<< k<&lt.

#include <iostream>#include <queue>#include <initializer_list>using namespace std;int main(){ //建堆 priority_queue<int, vector<int>, greater<int> > minheap; priority_queue<int, vector<int>, less<int&

问题出在g++编译的标准上。Mac的编译器默认是只支持C++98的标准的因此，系统不出错的方法就是更换标准，具体方法如下：g++ a.cpp 改为 g++ -std=c++11 a.cpp如果觉得这样很繁琐，可以直接将该命令简化为g++：echo "alias g++='g++ -std=c++11'" >> ~/.bash_profile"这样以后输入g++就相当于输入g++ -std=c++11 a.cpp了...

#include <iostream>#include <vector>#include <algorithm>using namespace std;int main(){ vector<int> a = { 2,4,6,7,1,10,24,8,9,6,3,2 }; vector<int>::iterator maxPosition = max_element(a.begin(), a.end()); cout