int8_t p[10]={15,2,0,4,16,17,5,18,19,21};

void setup() 
{
  for(int8_t n=0; n<=9;n++)pinMode(p[n],OUTPUT);
  
}

void loop() 
{
  for(int8_t n=0; n<=9;n++)
  {
    digitalWrite(p[n], HIGH);
    delay(200);
    digitalWrite(p[n], LOW);
  }
}