// int led1 = 2;
// int led2 = 4;
// int led3 = 6;
// int led4 = 8;

// int timer1 =850;
// int timer2 = 900;
// int timer3 = 950;
// int timer4 = 1000;

// unsigned long currentTime1;
// unsigned long previousTime1 = 0;
// unsigned long currentTime2;
// unsigned long previousTime2 = 0;
// unsigned long currentTime3;
// unsigned long previousTime3 = 0;
// unsigned long currentTime4;
// unsigned long previousTime4 = 0;

// unsigned long led1OnTime;
// unsigned long led2OnTime;
// unsigned long led3OnTime;
// unsigned long led4OnTime;

// bool led1State = false;
// bool led2State = false;
// bool led3State = false;
// bool led4State = false;

// void setup() {
//   // put your setup code here, to run once:
//   pinMode(led1, OUTPUT);
//   pinMode(led2, OUTPUT);
//   pinMode(led3, OUTPUT);
//   pinMode(led4, OUTPUT);
// }

// void loop() {
//   currentTime1 = millis();
//   currentTime2 = millis();
//   currentTime3 = millis();
//   currentTime4 = millis();

//   if (currentTime1 - previousTime1 >= timer1){
//       digitalWrite(led1, HIGH);
//       led1State = true;
//       led1OnTime = millis();
//       previousTime1 = currentTime1;
//   }
//   if (currentTime2 - previousTime2 >= timer2){
//       digitalWrite(led2, HIGH);
//       led2State = true;
//       led2OnTime = millis();
//       previousTime2 = currentTime2;
//   }
//   if (currentTime3 - previousTime3 >= timer3){
//       digitalWrite(led3, HIGH);
//       led3State = true;
//       led3OnTime = millis();
//       previousTime3 = currentTime3;
//   }
//   if (currentTime4 - previousTime4 >= timer4){
//       digitalWrite(led4, HIGH);
//       led4State = true;
//       led4OnTime = millis();
//       previousTime4 = currentTime4;
//   }

//   if (led1State && millis()- led1OnTime >= 100){
//     digitalWrite(led1, LOW);
//     led1State = false;
//   }
//   if (led2State && millis()- led2OnTime >= 100){
//     digitalWrite(led2, LOW);
//     led2State = false;
//   }
//   if (led3State && millis()- led3OnTime >= 100){
//     digitalWrite(led3, LOW);
//     led3State = false;
//   }
//   if (led4State && millis()- led4OnTime >= 100){
//     digitalWrite(led4, LOW);
//     led4State = false;
//   }

// }

const int ledPins[] = {9, 6, 5, 3};
const int timers[] = {700, 800, 900, 1000};
const int ledCount = sizeof(ledPins) / sizeof(ledPins[0]);

unsigned long previousTimes[ledCount] = {0};
unsigned long onTimes[ledCount] = {0};
bool ledStates[ledCount] = {false};

void setup() {
  for (int i = 0; i < ledCount; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  unsigned long currentTime = millis();

  for (int i = 0; i < ledCount; i++) {
    if (currentTime - previousTimes[i] >= timers[i]) {
      digitalWrite(ledPins[i], HIGH);
      ledStates[i] = true;
      onTimes[i] = currentTime;
      previousTimes[i] = currentTime;
    }

    if (ledStates[i] && currentTime - onTimes[i] >= 100) {
      digitalWrite(ledPins[i], LOW);
      ledStates[i] = false;
    }
  }
}