#include<bits/stdc++.h>
#define ll long long
using namespace std;

const int MAXN = 1e6+5;
ll n;
string op,ad;
map<string,int> mp;
stringstream s_in;

bool check(string s)
{
	ll a,b,c,d,e;
	int t=sscanf(s.c_str(),"%lld.%lld.%lld.%lld:%lld",a,b,c,d,e);
	if (t!=5) return 0;
	else if (a>255||b>255||c>255||d>255||e>65535) return 0;
	s_in<<a<<"."<<b<<"."<<c"."<<d<<":"<<e;
	if (s_in.str()!=s) return 0;
	return 1;
}

int main()
{
	cin>>n;
	for (int i=1;i<=n;i++)
	{
		cin>>op>>ad;
		if (!check(ad))
		{
			cout<<"ERR"<<endl;
			continue;
		}
		if (op=="Server")
		{
			if (!mp[ad]) 
			{
				cout<<"OK"<<endl;
				mp[ad]=i;
			}
			else cout<<"FAIL"<<endl;
		}
		else
		{
			if (!mp.count(ad)) cout<<"FAIL"<<endl;
			else cout<<mp[ad]<<endl;
		}
	}
	return 0;
}

本地编译错误

错误信息:[Error] expected ';' before string constant