题解 | #识别有效的IP地址和掩码并进行分类统计#

写的一坨屎，记录一下--

#include<bits/stdc++.h>

using namespace std;
int string2int(string str);
int ip2numvec(vector<int>& nums,string str);
void count_1(string str1,string str2);
int a=0;
int b=0;
int c=0;
int d=0;
int e=0;
int wrong=0;
int private_=0;
int main()
{

    string str;
    while(cin>>str)
    {
        int index = str.find('~');
        string str1 = str.substr(0,index);
        string str2 = str.substr(index+1);
        count_1(str1,str2);
    }
    cout<<a<<" "<<b<<" "<<c<<" "<<d<<" "<<e<<" "<<wrong<<" "<<private_;
    return 0;
}

void count_1(string str1,string str2)
{
    vector<int> nums;
    vector<int> nums2;
    char res;
    if(ip2numvec(nums,str1)&&ip2numvec(nums2,str2))
    {
        if(nums[0]==0||nums[0]==127)
            return;
        if(nums[0]>=1&&nums[0]<=126&&nums[1]>=0&&nums[1]<=255&&nums[2]>=0&&nums[2]<=255&&
                nums[3]>=0&&nums[3]<=255)
            res='A';
        else if(nums[0]>=128&&nums[0]<=191&&nums[1]>=0&&nums[1]<=255&&nums[2]>=0&&nums[2]<=255&&
                nums[3]>=0&&nums[3]<=255)
            res = 'B';
        else if(nums[0]>=192&&nums[0]<=223&&nums[1]>=0&&nums[1]<=255&&nums[2]>=0&&nums[2]<=255&&
                nums[3]>=0&&nums[3]<=255)
            res='C';
        else if(nums[0]>=224&&nums[0]<=239&&nums[1]>=0&&nums[1]<=255&&nums[2]>=0&&nums[2]<=255&&
                nums[3]>=0&&nums[3]<=255)
            res = 'D';
        else if(nums[0]>=240&&nums[0]<=255&&nums[1]>=0&&nums[1]<=255&&nums[2]>=0&&nums[2]<=255&&
                nums[3]>=0&&nums[3]<=255)
            res='E';
        else
            res='W';
        char res3='W';
        if(nums[0]==10&&nums[1]>=0&&nums[1]<=255&&nums[2]>=0&&nums[2]<=255&&
                nums[3]>=0&&nums[3]<=255)
            res3='P';
        if(nums[0]==172&&nums[1]>=16&&nums[1]<=31&&nums[2]>=0&&nums[2]<=255&&
                nums[3]>=0&&nums[3]<=255)
            res3='P';
        if(nums[0]==192&&nums[1]==168&&nums[2]>=0&&nums[2]<=255&&
                nums[3]>=0&&nums[3]<=255)
            res3='P';


        string restr="";
        for(int i=0; i<nums2.size(); ++i)
        {
            int m = nums2[i];
            string str1="";
            if(m==0)
                str1="00000000";
            while(m)
            {
                if(m%2==1)
                    str1.insert(str1.size(),1,'1');
                else
                    str1.insert(str1.size(),1,'0');
                m=m/2;
            }
            while(str1.size()<8){
                str1.insert(str1.size(),1,'0');
            }
            reverse(str1.begin(), str1.end());
            restr+=str1;
        }
        char res2='R';
        int flag=0;
        int num_1=0;
        int num_0=0;
        for(int i=0; i<restr.size(); ++i)
        {
            if(restr[i]=='0')
            {
                flag = 1;
            }
            if(flag==1&&restr[i]=='1')
                res2='W';
            if(restr[i]=='0')
                num_0++;
            else if(restr[i]=='1')
                num_1++;
        }
        if(num_0==0||num_1==0)
            res2='W';

        if(res=='W'||res2=='W'){
            if(res=='W'&&res2=='W')
                wrong+=2;
            else
                wrong++;
            return;
        }else{
            if(res=='A')
                a++;
            else if(res=='B')b++;
            else if(res=='C')c++;
            else if(res=='D')
            {
                d++;
            }
            else if(res=='E')e++;
            if(res3=='P')private_++;
        }
    }
    return;

}

int ip2numvec(vector<int>& nums,string str){
    vector<string> vec;
    int start = 0;
    for(int i=0;i<str.length();++i){
        if(str[i]=='.'){
            int len = i-start;
            if(len<1){
                wrong++; return 0;
            }
            vec.push_back(str.substr(start,len));
            start = i+1;
        }
    }
    if(vec.size()!=3){
        wrong++;return 0;
    }
    vec.push_back(str.substr(start));
    for(int i=0;i<vec.size();++i){
        int tmp = string2int(vec[i]);
        nums.push_back(tmp);
    }
    return 1;
}

int string2int(string str){
    int res=0;
    for(int i=0;i<str.size();++i){
        res = (str[i]-'0') + res*10;
    }
    return res;
}