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MostVirtualMachines.java
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MostVirtualMachines.java
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import java.util.List;
public class MostVirtualMachines {
static class LogEntry {
int timeStamp;
int instanceID;
String event;
public LogEntry(int timeStamp, int instanceID, String event) {
this.timeStamp = timeStamp;
this.instanceID = instanceID;
this.event = event;
}
}
public int mostVirtualMachines(List<LogEntry> logEntries, int startTime, int endTime) {
if (logEntries == null) {
throw new IllegalArgumentException("logEntries cannot be null");
}
if (startTime > endTime) {
throw new IllegalArgumentException(String.format("start time: %d cannot be larger than end time: %d", startTime, endTime));
}
int max = 0;
int curNumber = 0;
for (LogEntry logEntry : logEntries) {
if (logEntry.timeStamp > endTime) {
break;
}
if (logEntry.event.equals("start")) {
curNumber++;
} else {
curNumber--;
}
if (logEntry.timeStamp >= startTime) {
max = Math.max(max, curNumber);
}
}
return max;
}
public static void main(String[] args) {
MostVirtualMachines mostVirtualMachines = new MostVirtualMachines();
LogEntry logEntry1 = new LogEntry(1, 1, "start");
LogEntry logEntry2 = new LogEntry(2, 2, "start");
LogEntry logEntry3 = new LogEntry(3, 2, "terminate");
LogEntry logEntry4 = new LogEntry(4, 1, "terminate");
System.out.println(mostVirtualMachines.mostVirtualMachines(List.of(logEntry1, logEntry2, logEntry3, logEntry4), 0, 4));
}
}