make_pair:error C2665: no overloaded function could convert all the argument types

An exercise on C++ primer：Write a program to read a sequence of strings and ints,storing each into a pair.Store the pairs in a vector.

#include <vector>
#include <utility>
#include <string>
#include <iostream>

using namespace std;

int main()
{
	vector<pair<string, int>> v;
	string word, i;
	while (cin >> word >> i)
		v.push_back(make_pair( word, i ));
	
	return 0;
}

It reports:

> error C2665:
> 'std::vector<std::pair<std::string,int>,std::allocator<std::pair<std::string,int>>>::push_back':
> no overloaded function could convert all the argument types

Can someone tell me where the problem is?

string word, i;

You define the variable i as a std::string, when you're supposed to define it as an int:

std::string word;
int i;

With the current code, the call

make_pair( word, i )

is the same as

make_pair<std::string, std::string>( word, i )

There's no automatic conversion anywhere from std::pair<std::string, std::string> (create by your make_pair call) to a std::pair<std::string, int>. The two types are just not the same and not compatible in any way.