vector<int>::iterator result = find( L.begin( ), L.end( ), 3 ); //查找3 if ( result == L.end( ) ) //没找到 cout << "No" << endl; else //找到 cout << "Yes" << endl; } 记着要包含algorithm这一头文件,其定义了find这一函数。 资料参考:https://www.coonote.com/cplusplus-note/vector-find.html
cpp 运行 #include<vector>#include<algorithm> std::vector<int>vec={3,1,4,1,5,9};autoit=std::find(vec.begin(),vec.end(),5);// O(n) 时间复杂度 如果需要频繁查找元素，且元素具有可排序的特性，可以通过以下方式优化：将vector排序后使用std::binary_search或std::lower_bound，时间复杂度可降...
vector<int>vec; vec.push_back(123); vec.push_back(456); vector<int>::iterator findit=find(vec.begin(),vec.end(),123); //vector<int>::iterator findit = find(vec.begin(),vec.end(),111); if(findit==vec.end()) { printf("no find\n"); } else { printf("find[%d]\n",*fi...
the function returns last.find函数原型：template <class InputIterator, class T>InputIterator find (...
#include <vector> #include <iomanip> usingnamespacestd; voidprint(inta[],intlen) { for(inti=0;i<len;i++) { cout<<setw(2)<<a[i]<<" "; } cout<<endl; } intmain() { inta[]={1,2,3,3,5,6,6,3}; intalen=sizeof(a)/sizeof(int); ...
cout <<"The vector size is: " << s ; return 0; } Output: In this program, a vector is declared with string elements, unlike the above programs. But, the size() function prints the size of the vector. Example #4 CPP program that creates an empty vector and prints the size ...
// find the first struct in a vector with a double // member <= a given value #include <iostream> // std::cout #include <algorithm> // std::find_if #include <vector> // std::vector #include <iomanip> struct MyStruct { double price; }; double threshold = 0.0; bool PriceRanges...
vector<conststring*> finds = {}; What a function of? for(constauto& ref : finds) Nov 12, 2019 at 10:40pm keskiverto(10409) victoriowrote: I need to findasubstring. @malibor: Aword was requested, and that is what find_if() returns: first "valid" word (or none). ...
Elements that are found in newvector:60 例子2 #include<iostream>#include<algorithm>#include<vector>intmain(){std::vector<int> vct {50,60,70,80};std::vector<int>::iterator ti;std::cout<<"Initial vector:";for(intk=0; k<vct.size(); k++)std::cout<<" "<<vct[k];std::cout<<"...
问find_if不使用const_iteratorEN一.find运算 假设有一个int型的vector对象，名为vec，我们想知道其中是否包含某个特定值。 解决这个问题最简单的方法时使用标准库提供的find运算： 1 // value we'll look for 2 int search_value = 42; 3 4 //call find to see if that value is present 5 ...