#include <bits/stdc++.h>
using namespace std;
class a{
public:
vector<int> arr(5);
};
int main() {
a b;
}
why it is giving error at vector<int> arr(5);
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Name |
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It's not allowed. you can use
vector <int> arr = vector<int> (5);
Okay but why? how to declare this in class
vector<vector<pair<T, pair<T, T2>>>> adjList(5)
?vector<vector<pair<T, pair<T, T2>>>> adjList = vector<vector<pair<T, pair<T, T2>>>> (5)
like this?you can use auto type
vector<vector<pair<T, pair<T, T2>>>> adjList = vector<vector<pair<T, pair<T, T2>>>> (5)
this code is equal to fist code:
auto adjList = vector<vector<pair<T, pair<T, T2>>>> (5)
Wonderfull!
Vector size is set in the constructor function.
if you are declaring a class of 'a' then to declare a vector, you should follow this syntax
class fun { vector *v; public: fun() { v = new vector [5]; } };
this syntax is correct...i have used it so many times.
thanks in advance for writing this blog! I have had the same problem for a long time :)