满江红，麻烦看看

#include <bits/stdc++.h>
using namespace std;
struct node
{
	string sc;
	int a,b,c,d,e;
	char a1,b2,c3,d4;
}a[1005]; 
int main()
{
int i,n,j,flags,flagc,l;
	cin>>n;
	for(i=1;i<=n;i++)
	cin>>a[i].sc>>a[i].a>>a[i].a1>>a[i].b>>a[i].b2>>a[i].c>>a[i].c3>>a[i].d>>a[i].d4>>a[i].e;
	for(i=1;i<=n;i++)
	{
	flags=1;
	flagc=1;
    if(a[i].sc=="Server") 
    {
    if(a[i].a<=0||a[i].a>=255||a[i].b<=0||a[i].b>=255||a[i].c<=0||a[i].c>=255||a[i].d<=0||a[i].d>=255||a[i].e<=0||a[i].e>=65535||a[i].a1=='.'||a[i].b2=='.'||a[i].c3=='.'||a[i].d4==':')
    {cout<<"ERR"<<endl;
    flags=0; 
	}
	else
	for(j=i;j>=1;j--)
	if(a[j].sc=="Server"&&a[j].a==a[i].a&&a[j].b==a[i].b&&a[j].c==a[i].c&&a[j].d==a[i].d&&a[j].e==a[i].e)
    {
    cout<<"FAIL"<<endl;	
    flags=0; 
	}
    if(flags==1)
    cout<<"OK"<<endl;	
	 } 
	 if(a[i].sc=="Client")
	 {
    if(a[i].a<=0||a[i].a>=255||a[i].b<=0||a[i].b>=255||a[i].c<=0||a[i].c>=255||a[i].d<=0||a[i].d>=255||a[i].e<=0||a[i].e>=65535||a[i].a1=='.'||a[i].b2=='.'||a[i].c3=='.'||a[i].d4==':')
    {cout<<"ERR"<<endl;
    flagc=2; 
	}
	for(l=i;l>=1;l--)
	if(a[l].sc=="Server"&&a[l].a==a[i].a&&a[l].b==a[i].b&&a[l].c==a[i].c&&a[l].d==a[i].d&&a[l].e==a[i].e)
    {
    cout<<l<<endl;	
    flagc=1; 
	}
	if(flagc==0)
	cout<<"FAIL"<<endl;
	 }
	}