题解 | #整数与IP地址间的转换#
整数与IP地址间的转换
https://www.nowcoder.com/practice/66ca0e28f90c42a196afd78cc9c496ea
#include<iostream>
#include<sstream>
#include<vector>
using namespace std;
long getNum(string& s){
vector<long> nums;
long i=0,n=s.size();
while(i<n){
long start=i;
while(i<n&&s[i]!='.') i++;
nums.push_back(stoi(s.substr(start,i-start)));
i++;
}
long res=0;
for(long i=0;i<4;i++){
res=res*256+nums[i];
}
return res;
}
string getIp(long num){
string res;
res='.'+to_string(num%256)+res;
num/=256;
res='.'+to_string(num%256)+res;
num/=256;
res='.'+to_string(num%256)+res;
num/=256;
res=to_string(num)+res;
return res;
}
int main(){
string s;
long num;
getline(cin,s);
cin>>num;
long res=getNum(s);
string ip=getIp(num);
cout<<res<<endl;
cout<<ip<<endl;
}
