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#include <iostream>
#include <map>
#include <vector>
 
using namespace std;
 
int main() {
 
	const int bucket_size = 10;
	int one;
	int two;
 
	int userInput = 0;
	vector<int> myVector;
 
	cout << "Enter student's grades (-1 to stop list): ";
 
	//stores grades in vector while not -1
 
	while(userInput != -1){
		cin >> userInput;
		myVector.push_back(userInput);
	}
 
	//create map from integer to integer for histogram algorithm
 
	map<int, int> histogram;
 
	histogram.first = one;
	histogram.second = two;
 
 
 
 
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:29:12: error: ‘class std::map<int, int>’ has no member named ‘first’
  histogram.first = one;
            ^~~~~
prog.cpp:30:12: error: ‘class std::map<int, int>’ has no member named ‘second’; did you mean ‘end’?
  histogram.second = two;
            ^~~~~~

Standard output is empty