rt，题目，评测记录。

导致RE的代码片段，初步猜测是 stio 函数的问题：

//判断前导零
        for(int i = 1;i <= 4;i ++)
            if(to_string((int)stoi(qwq[i])) != qwq[i]){
                cout<<"ERR"<<endl;
                goto kill;
            }
        //判断范围
        for(int i = 1;i <= 4;i ++)
            if(stoi(qwq[i]) < 0 || stoi(qwq[i]) > 255){
                cout<<"ERR"<<endl;
                goto kill;
            }
        if(stoi(qwq[5]) < 0 || stoi(qwq[5]) > 65535){
            cout<<"ERR"<<endl;
          

完整代码：

#include<bits/stdc++.h>
using namespace std;
unordered_map<string,int> um;
string op,ad;
int n;
int main(){
    cin>>n;
    for(int q = 1;q <= n;q ++){
        if(114514 == 1919810){
            kill:continue;
        }
        cin>>op>>ad;
        //判断格式
        string k;
        for(int i = 0;i < ad.size();i ++)
            if(ad[i] == '.' || ad[i] == ':')
                k.push_back(ad[i]);
        if(k != "...:"){
            cout<<"ERR"<<endl;
            goto kill;
        }
        //截取字符串
        string find[] = {"艹什么毒瘤题目",".",".",".",":"},qwq[10];
        k = ad;
        for(int i = 1;i <= 4;i ++)
            for(int j = 0;j < k.size();j ++)
                if(k[j] == find[i][0]){
                    qwq[i] = k.substr(0,j);
                    k.erase(0,j + 1);
                    break;
                }
        qwq[5] = k;
        for(int i = 1;i <= 5;i ++)
            if(!qwq[i].size()){
                cout<<"ERR"<<endl;
                goto kill;
            }
        //判断前导零
        for(int i = 1;i <= 4;i ++)
            if(to_string((int)stoi(qwq[i])) != qwq[i]){
                cout<<"ERR"<<endl;
                goto kill;
            }
        //判断范围
        for(int i = 1;i <= 4;i ++)
            if(stoi(qwq[i]) < 0 || stoi(qwq[i]) > 255){
                cout<<"ERR"<<endl;
                goto kill;
            }
        if(stoi(qwq[5]) < 0 || stoi(qwq[5]) > 65535){
            cout<<"ERR"<<endl;
            goto kill;
        }
        //连接
        if(op[0] == 'S'){
            if(!um[ad]){
                um[ad] = q;
                cout<<"OK"<<endl;
            }
            else cout<<"FAIL"<<endl;
        }
        else {
            if(um[ad])
                cout<<um[ad]<<endl;
            else cout<<"FAIL"<<endl;
        }
    }
    return 0;
}

希望有大佬帮我这个可怜的蒟蒻吧