Q2.cpp

// Name: 黃志仁
// Date: 2017/03/11
// Last Update: 2017/03/11
// Problem statement: Sort and output the input number with occurences

#include <iostream>
#include <fstream>
#include <map>
using namespace std;
int main() {
    int N;
    map < int, int, greater < int > > intArr; //define a map which is sort from max to min
    ifstream inFile("intArray.txt");
	ofstream outFile("output.txt"); //read file
    while (inFile >> N) {
        if (intArr.find(N) == intArr.end()) intArr[N] = 1;
        else intArr[N]++;
    }
    //if N exist , + counter
    //else insert an element

    map < int, int > ::iterator it;
    outFile << "N" << "\t" << "Count" << endl;
    for (it = intArr.begin(); it != intArr.end(); it++)
        outFile << it -> first << "\t" << it -> second << endl; //just output
}