//
// Program for homework 10 - Exercise 2 - CCOM3033
//

#include <iostream>
#include <fstream>

using namespace std;

const int ROWS = 20, COLS = 20;

//
// Function printArray(A, rows):
// Given A, a two-dim array of characters, prints it
//

void printArray(char A[][COLS], int rows) {
    for (int r = 0; r < rows; r++) {
        for (int c = 0; c < COLS; c++)
            cout << A[r][c] << " ";
        cout << endl;
    }
    cout << endl;
}

//
// Function readArrayFromFile(fileName, A, rows):
// Given the name of a file, reads its contents to the provided
// 2-dim array (A). The file must contain 20 strings of 20 letters
// each.
// Returns true if the file was read correctly, otherwise false
//

bool readArrayFromFile(string fileName, char A[][COLS], int rows) {
    ifstream inFile;
    inFile.open(fileName.c_str());

    if (inFile.fail())return false;

    // reads the contents of the file onto a two dimensional array
    char c;
    int ctr = 0;
    while(inFile >> c) {
        A[ctr/ROWS][ctr%COLS] = c;
        ctr++;
    }
    return true;

}

//
// This is the function that you should implement.
//
//
// Function uniqueLandUse(A,rows):
// Given A, a two-dim array of chars returns how many different
// chars are in the array.
//

int uniqueLandUse(char A[][COLS], int rows) {

    // your code here!!!

    return 0;
}

//
// The main program simply reads the file in to a 2-dim array and
// then invokes the uniqueLandUse function to compute the number of
// unique land uses.
//

int main() {
    char A[ROWS][COLS];
    string fileName = "input.txt";

    if ( readArrayFromFile(fileName, A , ROWS) ) {
        printArray(A,ROWS);
        cout << "The number of unique land uses is: "
             << uniqueLandUse(A, ROWS) << endl;
    }
    else
        cout << "Problem reading the file: " << fileName << endl;

   return 0;
}