一道大模拟，没什么好说的。（自己调试就好）

#include<bits/stdc++.h>
using namespace std;
map<string,int>mp;
signed main()
{
    int _;
    scanf("%d",&_);
    for(int __ = 1;__<=_;__++)
    {
        string s;
        string ss;
        cin >> s >> ss;
        int qq = 0;
        if(s == "Server")
        {
            int i;
            int a = 0,b = 0,c = 0,d = 0,e = 0;
            int numa = 0,numb = 0,numc = 0,numd = 0,nume = 0;
            int xa = 1;
            int num = 0;
            bool flag = 0;  
            for(i = 0;ss[i]!='.'&&i<ss.size();i++)
            {
                qq++;
                if(ss[i] == '-'&&!num)
                {
                    num++;
                    xa = -1;
                    numa++;
                    continue;
                }
                if(ss[i]<'0'||ss[i]>'9')
                {
                    flag = 1;
                    break;
                }
                numa++;
                a = a*10+ss[i]-'0';
            }
            a*=xa;
            if(flag||qq == 0)
            {
                printf("ERR\n");
            }
            else
            {
                if(to_string(a).size()!=numa||ss[i+1]<'0'||ss[i+1]>'9')
                {   
                    printf("ERR\n");
                }
                else
                {
                    int xb = 1;
                    int num = 0;
                    bool flag = 0;
                    qq = 0;
                    i++;
                    for(;ss[i]!='.'&&i<ss.size();i++)
                    {
                        qq++;
                        if(ss[i] == '-'&&!num)
                        {
                            num++;
                            xb = -1;
                            numb++;
                            continue;
                        }
                        if(ss[i]<'0'||ss[i]>'9')
                        {
                            flag = 1;
                            break;
                        }
                        numb++;
                        b = b*10+ss[i]-'0';
                    }
                    b*=xb;
                    if(flag||qq == 0)
                    {
                        printf("ERR\n");
                    }
                    else
                    {
                        if(to_string(b).size()!=numb||ss[i+1]<'0'||ss[i+1]>'9')
                        {
                            printf("ERR\n");
                        }
                        else
                        {
                            int xc = 1;
                            int num = 0;
                            i++;
                            bool flag = 0;
                            qq = 0;
                            for(;ss[i]!='.'&&i<ss.size();i++)
                            {
                                qq++;
                                if(ss[i] == '-'&&!num)
                                {
                                    num++;
                                    xc = -1;
                                    numc++;
                                    continue;
                                }
                                if(ss[i]<'0'||ss[i]>'9')
                                {
                                    flag = 1;
                                    break;
                                }
                                numc++;
                                c = c*10+ss[i]-'0';
                            }
                            c*=xc;
                            if(flag||qq == 0)
                            {
                                printf("ERR\n");
                            }
                            else
                            {
                                if(to_string(c).size()!=numc||ss[i+1]<'0'||ss[i+1]>'9')
                                {
                                    printf("ERR\n");
                                }
                                else
                                {
                                    qq = 0;
                                    i++;
                                    bool flag = 0;
                                    int xd = 1;
                                    int num = 0; 
                                    for(;ss[i]!=':'&&i<ss.size();i++)
                                    {
                                        qq++;
                                        if(ss[i] == '-'&&!num)
                                        {
                                            num++;
                                            xd = -1;
                                            numd++;
                                            continue;
                                        }
                                        if(ss[i]<'0'||ss[i]>'9')
                                        {
                                            flag = 1;
                                            break;
                                        }
                                        numd++;
                                        d = d*10+ss[i]-'0';
                                    }
                                    d*=xd;
                                    if(flag||qq == 0)
                                    {
                                        printf("ERR\n");
                                    }
                                    else
                                    {
                                        if(to_string(d).size()!=numd||ss[i+1]<'0'||ss[i+1]>'9')
                                        {
                                            printf("ERR\n");
                                        }
                                        else
                                        {
                                            qq = 0;
                                            i++;
                                            bool flag = 0;
                                            int xe = 1;
                                            int num = 0;
                                            for(;i<ss.size();i++)
                                            {
                                                qq++;
                                                if(ss[i] == '-'&&!num)
                                                {
                                                    num++;
                                                    xe = -1;
                                                    nume++;
                                                    continue;
                                                }
                                                if(ss[i]<'0'||ss[i]>'9')
                                                {
                                                    flag = 1;
                                                    break;
                                                }
                                                nume++;
                                                e = e*10+ss[i]-'0';
                                            }
                                            e*=xe;
                                            if(flag||qq == 0)
                                            {
                                                printf("ERR\n");
                                            }
                                            else
                                            {
                                                if(to_string(e).size()!=nume)
                                                {
                                                    printf("ERR\n");
                                                }
                                                else
                                                {
                                                    if(a>255||a<0||b>255||b<0||c>255||c<0||d>255||d<0||e<0||e>65535)
                                                    {
                                                        printf("ERR\n");
                                                    }
                                                    else
                                                    {
                                                        if(mp.find(ss) == mp.end())
                                                        {
                                                            mp[ss] = __;
                                                            printf("OK\n");
                                                        }
                                                        else
                                                        {
                                                            printf("FAIL\n");
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        else
        {
            int i;
            int a = 0,b = 0,c = 0,d = 0,e = 0;
            int numa = 0,numb = 0,numc = 0,numd = 0,nume = 0;
            int xa = 1;
            int num = 0;
            qq = 0;
            bool flag = 0;
            for(i = 0;ss[i]!='.'&&i<ss.size();i++)
            {
                qq++;
                if(ss[i] == '-'&&!num)
                {
                    num++;
                    xa = -1;
                    numa++;
                    continue;
                }
                if(ss[i]<'0'||ss[i]>'9')
                {
                    flag = 1;
                    break;
                }
                numa++;
                a = a*10+ss[i]-'0';
            }
            a*=xa;
            if(flag||qq == 0)
            {
                printf("ERR\n");
            }
            else
            {
                if(to_string(a).size()!=numa||ss[i+1]<'0'||ss[i+1]>'9')
                {
                    printf("ERR\n");
                }
                else
                {
                    qq = 0;
                    int xb = 1;
                    int num = 0;
                    bool flag = 0;
                    i++;
                    for(;ss[i]!='.'&&i<ss.size();i++)
                    {
                        qq++;
                        if(ss[i] == '-'&&!num)
                        {
                            num++;
                            xb = -1;
                            numb++;
                            continue;
                        }
                        if(ss[i]<'0'||ss[i]>'9')
                        {
                            flag = 1;
                            break;
                        }
                        numb++;
                        b = b*10+ss[i]-'0';
                    }
                    b*=xb;
                    if(flag||qq == 0)
                    {
                        printf("ERR\n");
                    }
                    else
                    {
                        if(to_string(b).size()!=numb||ss[i+1]<'0'||ss[i+1]>'9')
                        {
                            printf("ERR\n");
                        }
                        else
                        {
                            qq = 0;
                            int xc = 1;
                            int num = 0;
                            i++;
                            bool flag = 0;
                            for(;ss[i]!='.'&&i<ss.size();i++)
                            {
                                qq++;
                                if(ss[i] == '-'&&!num)
                                {
                                    num++;
                                    xc = -1;
                                    numc++;
                                    continue;
                                }
                                if(ss[i]<'0'||ss[i]>'9')
                                {
                                    flag = 1;
                                    break;
                                }
                                numc++;
                                c = c*10+ss[i]-'0';
                            }
                            c*=xc;
                            if(flag||qq == 0)
                            {
                                printf("ERR\n");
                            }
                            else
                            {
                                if(to_string(c).size()!=numc||ss[i+1]<'0'||ss[i+1]>'9')
                                {
                                    printf("ERR\n");
                                }
                                else
                                {
                                    qq = 0;
                                    i++;
                                    bool flag = 0;
                                    int xd = 1;
                                    int num = 0; 
                                    for(;ss[i]!=':'&&i<ss.size();i++)
                                    {
                                        qq++;
                                        if(ss[i] == '-'&&!num)
                                        {
                                            num++;
                                            xd = -1;
                                            numd++;
                                            continue;
                                        }
                                        if(ss[i]<'0'||ss[i]>'9')
                                        {
                                            flag = 1;
                                            break;
                                        }
                                        numd++;
                                        d = d*10+ss[i]-'0';
                                    }
                                    d*=xd;
                                    if(flag||qq == 0)
                                    {
                                        printf("ERR\n");
                                    }
                                    else
                                    {
                                        if(to_string(d).size()!=numd||ss[i+1]<'0'||ss[i+1]>'9')
                                        {
                                            printf("ERR\n");
                                        }
                                        else
                                        {
                                            qq = 0;
                                            i++;
                                            bool flag = 0;
                                            int xe = 1;
                                            int num = 0;
                                            for(;i<ss.size();i++)
                                            {
                                                qq++;
                                                if(ss[i] == '-'&&!num)
                                                {
                                                    num++;
                                                    xe = -1;
                                                    nume++;
                                                    continue;
                                                }
                                                if(ss[i]<'0'||ss[i]>'9')
                                                {
                                                    flag = 1;
                                                    break;
                                                }
                                                nume++;
                                                e = e*10+ss[i]-'0';
                                            }
                                            e*=xe;
                                            if(flag||qq == 0)
                                            {
                                                printf("ERR\n");
                                            }
                                            else
                                            {
                                                if(to_string(e).size()!=nume)
                                                {
                                                    printf("ERR\n");
                                                }
                                                else
                                                {
                                                    if(a>255||a<0||b>255||b<0||c>255||c<0||d>255||d<0||e<0||e>65535)
                                                    {
                                                        printf("ERR\n");
                                                    }
                                                    else
                                                    {
                                                        if(mp.find(ss)!=mp.end())
                                                        {
                                                            printf("%d\n",mp[ss]);
                                                        }
                                                        else
                                                        {
                                                            printf("FAIL\n");
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    return 0;
}