代码：

#include<bits/stdc++.h>
using namespace std;
long long n,cnt;
string name,s;
map<string,long long>mp;
bool j(){
	long long a=-1,b=-1,c=-1,d=-1,e=-1;
	if(5!=sscanf(s.c_str(),"%lld.%lld.%lld.%lld:%lld",&a,&b,&c,&d,&e))return 0;
	stringstream ss;
	ss<<a<<"."<<b<<"."<<c<<"."<<d<<":"<<e;
	if(a<0 || a>255 || b<0 || b>255 || c<0 || c>255 || d<0 || d>255 || e<0 || e>65535){
		return 0;
	}
	return ss.str()==s;
} 
int main(){
	//freopen("P7911_2.in","r",stdin);
	//freopen("P7911_2.out","w",stdout);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>name>>s;
		if(!j()){
			cout<<"ERR"<<endl;
		}else if(name[0]=='S'){
			if(mp[s]){
				cout<<"FALL\n";
			}else{
				mp[s]=i;
				cout<<"OK\n";
			}
		}else{
			if(!mp[s]){
				cout<<"FALL\n";
				continue;
			}else{
				cout<<mp[s]<<"\n";
			}
		}
	}
	return 0;
}

为什么样例二本地测试过了，提交却wa。