What is solution for error in vector in C++?

Question

/* // Sample code to perform I/O: #include <iostream> using namespace std; int main() { int num; cin >> num; // Reading input from STDIN cout << "Input number is " << num << endl; // Writing output to STDOUT } // Warning: Printing unwanted or ill-formatted data to output will cause the test cases to fail */ // Write your code here #include<iostream> #include<string> #include<vector> #include <algorithm> using namespace std; typedef long long int ll; vector<ll> v; void make(ll num) { if(num>10000000000) return ; if(num!=0) v.insert(num); make(num*10+4); make(num*10+7); } int main() { ios::sync_with_stdio(false); cin.tie(nullptr); ll num=0; make(num); ll n,ans=0; cin>>n; for(auto i:v) { for(auto j:v) { if(i<=n&&j<=n&&j>=i) { if(__gcd(i,j)==1) ans++; } } } cout<<ans<<endl; return 0; }

Error:

In function 'void make(ll)': 30:21: error: no matching function for call to 'std::vector<long long int>::insert(ll&)' 69:0, 20: 114:5: note: candidate: std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::insert(std::vector<_Tp, _Alloc>::const_iterator, const value_type&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; std::vector<_Tp, _Alloc>::iterator = __gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >; typename std::_Vector_base<_Tp, _Alloc>::pointer = long long int*; std::vector<_Tp, _Alloc>::const_iterator = __gnu_cxx::__normal_iterator<const long long int*, std::vector<long long int> >; typename __gnu_cxx::__alloc_traits<typename std::_Vector_base<_Tp, _Alloc>::_Tp_alloc_type>::const_pointer = const long long int*; std::vector<_Tp, _Alloc>::value_type = long long int] : 114:5: note: candidate expects 2 arguments, 1 provided 64:0, 20: 1042:7: note: candidate: std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::insert(std::vector<_Tp, _Alloc>::const_iterator, std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; std::vector<_Tp, _Alloc>::iterator = __gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >; typename std::_Vector_base<_Tp, _Alloc>::pointer = long long int*; std::vector<_Tp, _Alloc>::const_iterator = __gnu_cxx::__normal_iterator<const long long int*, std::vector<long long int> >; typename __gnu_cxx::__alloc_traits<typename std::_Vector_base<_Tp, _Alloc>::_Tp_alloc_type>::const_pointer = const long long int*; std::vector<_Tp, _Alloc>::value_type = long long int] 1042:7: note: candidate expects 2 arguments, 1 provided 1059:7: note: candidate: std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::insert(std::vector<_Tp, _Alloc>::const_iterator, std::initializer_list<_Tp>) [with _Tp = long long int; _Alloc = std::allocator<long long int>; std::vector<_Tp, _Alloc>::iterator = __gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >; typename std::_Vector_base<_Tp, _Alloc>::pointer = long long int*; std::vector<_Tp, _Alloc>::const_iterator = __gnu_cxx::__normal_iterator<const long long int*, std::vector<long long int> >; typename __gnu_cxx::__alloc_traits<typename std::_Vector_base<_Tp, _Alloc>::_Tp_alloc_type>::const_pointer = const long long int*] 1059:7: note: candidate expects 2 arguments, 1 provided 1084:7: note: candidate: std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::insert(std::vector<_Tp, _Alloc>::const_iterator, std::vector<_Tp, _Alloc>::size_type, const value_type&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; std::vector<_Tp, _Alloc>::iterator = __gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >; typename std::_Vector_base<_Tp, _Alloc>::pointer = long long int*; std::vector<_Tp, _Alloc>::const_iterator = __gnu_cxx::__normal_iterator<const long long int*, std::vector<long long int> >; typename __gnu_cxx::__alloc_traits<typename std::_Vector_base<_Tp, _Alloc>::_Tp_alloc_type>::const_pointer = const long long int*; std::vector<_Tp, _Alloc>::size_type = long unsigned int; std::vector<_Tp, _Alloc>::value_type = long long int] 1084:7: note: candidate expects 3 arguments, 1 provided 1128:2: note: candidate: template<class _InputIterator, class> std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::insert(std::vector<_Tp, _Alloc>::const_iterator, _InputIterator, _InputIterator) [with _InputIterator = _InputIterator; <template-parameter-2-2> = <template-parameter-1-2>; _Tp = long long int; _Alloc = std::allocator<long long int>] 1128:2: note: template argument deduction/substitution failed: 30:21: note: candidate expects 3 arguments, 1 provided<br>

How to solve the problem

the function iterator insert( iterator pos, const T& value ); takes in an iterator and the value — sebastian
– sebastian, Commented Aug 23, 2020 at 18:11
There is no function called insert in vector. What is __gcd? Is it a user-defined function created by you? — Sumeet
– Sumeet, Commented Aug 23, 2020 at 18:12
@Sumeet, G.M.'s comment contains a link that proves you wrong. — Fureeish
– Fureeish, Commented Aug 23, 2020 at 18:20
typedef long long int ll; -- I see this crazy macro too often. Why not simply use int64_t instead of this? It is more descriptive of exactly the type of integer you want to use, and isn't something that looks like the number 11. — PaulMcKenzie
– PaulMcKenzie, Commented Aug 23, 2020 at 18:26

Anmol 270900 · Accepted Answer · 2020-08-23 18:17:18Z

7

In function make(), try using v.push_back(num) instead of v.insert(num) it should work.

answered Aug 23, 2020 at 18:17

Anmol 270900

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Comments

Giogre · Accepted Answer · 2020-08-23 18:31:25Z

You lack the first parameter in your vector::insert, the position the new element should be placed after. If you don't want to use vector::push_back as suggested in the previous answer, here is a MWE:

#include<iostream> #include<string> #include<vector> #include <algorithm> using namespace std; typedef long long int ll; vector<ll> v; void make(ll num) { if(num>10000000000) return; if(num!=0) v.insert(v.begin(),num); // iterator to insert position added make(num*10+4); make(num*10+7); } int main() { ios::sync_with_stdio(false); cin.tie(nullptr); ll num=0; make(num); ll n,ans=0; cout << "Input number: " << endl; cin>>n; for(auto i:v) { for(auto j:v) { if(i<=n&&j<=n&&j>=i) { if(__gcd(i,j)==1) ans++; } } } cout<< "answer = " << ans <<endl; return 0; }

What is this for? A random number generator?

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