需要帮助创建Arduino (c/c++)的无限数组

我正试图制作一个arduino Simon说的副本，孩子们的游戏，你按颜色在相同的连续他们出现之前，在学校独立学习的快乐棒。我认为我到目前为止所拥有的将或将工作，然而我所做的数组给了我"错误:'setOrder'的存储大小是未知的"，这是有意义的，因为我已经声明它为"int setOrder[];"，但这正是我想要的。数组在创建时没有变量，但可以随着游戏进程添加变量……这是我在我的代码到目前为止，请告诉我它是什么样子的，以及我如何可以使这样的数组。谢谢你! !

int xAxis = A0;
int yAxis = A1;
int push = 6;
int blue = 9;
int yellow = 10;
int green = 11;
int red = 12;
int play = 0;
int setOrder[];      /* HERE IS THE PROBLEM */
void setup()
{
  Serial.begin(9600);
  pinMode(blue, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(red, OUTPUT);
  pinMode(push, INPUT);
  digitalWrite(push, HIGH); 
}
void loop()
{
 if(!digitalRead(push)){
   play = 1;
   Serial.println("start!");
 } 
 if(play = 1){
   for(int i = 0; i<=sizeof(setOrder); i++){
     setOrder[i] = random(1, 4);
     for(int j = 0; j<=sizeof(setOrder); j++){
       int k = setOrder[j];
       if(k=1){
       digitalWrite(blue, HIGH); delay(750); digitalWrite(blue, LOW);
       }
       if(k=2){
       digitalWrite(yellow, HIGH); delay(750); digitalWrite(yellow, LOW);
       }
       if(k=3){
       digitalWrite(green, HIGH); delay(750); digitalWrite(green, LOW);
       }
       if(k=4){
       digitalWrite(red, HIGH); delay(750); digitalWrite(red, LOW);
       }
     }  
     int playback[sizeof(setOrder)];
     for(int l = 0; l<=sizeof(playback); l++){
       //player presses RIGHT green led
       if(analogRead(xAxis) > 600){
         playback[l] = 4;
           if(playback[l] == setOrder[l]){
             digitalWrite(green, HIGH);
           }
           else{
             digitalWrite(green, HIGH); digitalWrite(blue, HIGH); digitalWrite(yellow, HIGH); digitalWrite(red, HIGH);
             play = 0;
             break;
           }
       }
       //player presses LEFT yellow led
       if(analogRead(xAxis) < 400){
         playback[l] = 2;
           if(playback[l] == setOrder[l]){
             digitalWrite(yellow, HIGH);
           }
           else{
             digitalWrite(green, HIGH); digitalWrite(blue, HIGH); digitalWrite(yellow, HIGH); digitalWrite(red, HIGH);
             play = 0;
             break;
           }
       }
       //player presses DOWN blue led
       if(analogRead(yAxis) > 600){
         playback[l] = 1;
           if(playback[l] == setOrder[l]){
             digitalWrite(blue, HIGH);
           }
           else{
             digitalWrite(green, HIGH); digitalWrite(blue, HIGH); digitalWrite(yellow, HIGH); digitalWrite(red, HIGH);
             play = 0;
             break;
           }
       }
       //player presses UP red led
       if(analogRead(yAxis) < 400){
         playback[l] = 3;
           if(playback[l] == setOrder[l]){
             digitalWrite(red, HIGH);
           }
           else{
             digitalWrite(green, HIGH); digitalWrite(blue, HIGH); digitalWrite(yellow, HIGH); digitalWrite(red, HIGH);
             play = 0;
             break;
           }
       }
     }
   }
 }
}

我也不确定我是否正确使用了"break();"方法，如果有人能告诉我那就太好了!再次感谢。