#include <Keypad.h>

const int row_num = 4;
const int col_num = 4;

int score = 0;

char keys[row_num][col_num] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}};

byte row_pins[] = {19,18,5,17};
byte col_pins[] = {16,4,2,15};

Keypad k = Keypad( makeKeymap(keys), row_pins , col_pins, row_num, col_num);

void setup() {
  Serial.begin(115200);
}

void loop() {
  byte random_row = random(1,5); 
  byte random_column = random(1,5); 
  char random_element = keys[random_row-1][random_column-1];
  String hint1 = "The element is in row : " + String(random_row); 
  String hint2 = "The element is in column : " + String(random_column); 
  byte random_hint = random(1,3); 
  if (random_hint == 1)
  Serial.println(hint1); 
  else Serial.println(hint2);
  byte chances = 2;

  while (chances) {
    char key = k.getKey();

    if (key) {
      if (key == random_element) {
        Serial.println("YOU WON!");
        break;
      } 
      else{
        chances --;
        if (chances){
          Serial.println("WRONG! Try again");
        }
        else{
          Serial.println("YOU LOSE!");
          break;
        }
      }
    }
  }
}