c++ Error

Question

What is a wrong here i got compiler error ?
# include <bits/stdc++.h>
using namespace std;
int main()
{
freopen(R"(F:\Contest - 13 - 3\2\in.txt.txt)", "r", stdin);
int x;
vector<pair<int, int>> v;
while (cin >> x)
{
auto it = find(v.begin()->first, v.end()->first, x);
if (it != v.end()->first)
v[it].second++;
else
v.emplace_back(x, 1);
}
for (auto it : v)
cout << it.first << " " << it.second << endl;
}

Answer 1

Even if you change the way you call `find`, you are still not likely to find anything. Your vector is empty.
Maybe take a look at std::map? you mentioned "key".

Answer 2

Is that the whole code?
Can you describe what you wanted or expected to do with this code?

Answer 3

What should I do if i want to find the key only from pair