if(!flag){

maxSeqNum = seqNo;

window.insert(seqNo);

flag = true;

}

if(seqNo <= maxSeqNum - 5){

return;

}

else if(seqNo > maxSeqNum){

if(seqNo - maxSeqNum >= 5){

window.clear();

}

window.insert(seqNo);

lp += seqNo - maxSeqNum - 1;

maxSeqNum = seqNo;

}

else if ( (seqNo > (maxSeqNum - 5)) && (seqNo < maxSeqNum) ){

if(window.find(seqNo) == window.end()){

window.insert(seqNo);

op += 1;

lp = (lp == 0 ? 1: lp - 1);

}

}

cout<<"seq no. ="<<seqNo<<"; maxSeqNo = "<<maxSeqNum<<"; lostpackets = "<<lp<<"; out_of_order packets = "<<op<<endl;

return;

int a[] = { 3,5,4,7, 7,11,8,9, 17, 12,12, 15, 18, 16};

for (int i=0; i< sizeof(a)/sizeof(*a); ++i){

checkPackets(a[i]);

}

return 1;

}