Trouble in inserting float values 2d vectors

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C++

#include<iostream>
#include<vector>

using namespace std;

int main()
{
   vector< vector< float > > v;
   float x;
   for(int i = 0;i < 3; i++)
   {
      for(int j = 0;j < 3 ; j++)
      {
        cin >> x;
        v.push_back(x);
      }
   }
   
   for(int i = 0;i < 3; i++)
   {
      for(int j = 0;j < 3; j++)
      {
         cout << v[i][j];
      }
   }
   return 0;
}

What I have tried:

i have tried the above code but it shows error:
no matching function for call to 'std::vector<std::vector xmlns:std="#unknown"><int> >::push_back(int&)'
v.push_back(x);