Programing/Algorithm

poj 2105 IP Adress

sosal 2014. 4. 30. 21:33
반응형

/*

 http://sosal.tistory.com/
 * made by so_Sal
 */

IP Address
Time Limit: 1000MSMemory Limit: 30000K
Total Submissions: 18283Accepted: 10535

Description

Suppose you are reading byte streams from any device, representing IP addresses. Your task is to convert a 32 characters long sequence of '1s' and '0s' (bits) to a dotted decimal format. A dotted decimal format for an IP address is form by grouping 8 bits at a time and converting the binary representation to decimal representation. Any 8 bits is a valid part of an IP address. To convert binary numbers to decimal numbers remember that both are positional numerical systems, where the first 8 positions of the binary systems are: 
27   26  25  24  23   22  21  20 

128 64 32 16 8 4 2 1

Input

The input will have a number N (1<=N<=9) in its first line representing the number of streams to convert. N lines will follow.

Output

The output must have N lines with a doted decimal IP address. A dotted decimal IP address is formed by grouping 8 bit at the time and converting the binary representation to decimal representation.

Sample Input

4
00000000000000000000000000000000 
00000011100000001111111111111111 
11001011100001001110010110000000 
01010000000100000000000000000001 

Sample Output

0.0.0.0
3.128.255.255
203.132.229.128
80.16.0.1

Source


8자리 문자열을 통해 이진수를 받아서 10진수로 바꿔주는 함수만 만들면

매우 쉽게 해결할 수 있습니다.


#include<iostream> #include<vector> #include<algorithm> #include<iomanip> #include<string> #include<cmath> using namespace std; int convert(string input){ int result = 0; for(int i=0;i<input.size();i++){ if(input[i] == '1'){ result+= pow((double)2,7-i); } } return result; } int main(void){ int n; cin>>n; string input; for(int i=0;i<n;i++){ input.clear(); cin>>input; string a = input.substr(0,8); string b = input.substr(8,8); string c = input.substr(16,8); string d = input.substr(24,8); cout<<convert(a)<<"."<<convert(b)<<"."<<convert(c)<<"."<<convert(d)<<endl; } }


'Programing > Algorithm' 카테고리의 다른 글

poj 2140 Herd Sums  (0) 2014.05.06
algospot - HAMMINGCODE  (0) 2014.05.06
algospot - Divisibility  (0) 2014.05.06
poj 2608 Soundex  (0) 2014.05.06
acmicpc 수찾기: 1920  (0) 2014.04.30