# PE49

Mar 15th, 2013
70
Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
1. #include <iostream>
2. #include <fstream>
3. #include <string>
4. #include <sstream>
5. #include <vector>
6. #include <algorithm>
7.
8. #include "time.h"
9. using namespace std;
10.
11. bool isPerm(int, int);
12.
13. int main() {
14.     clock_t t1, t2;
15.
16.     int temp, i, j, diff;
17.     vector<int> primes;
18.     ifstream inputFile("primes.txt");
19.     while(inputFile >> temp)
20.     {
21.         if(temp!=1487 && temp != 4817 && temp!=8147)
22.             primes.push_back(temp);
23.     }
24.
25.     t1 = clock();
26.
27.     for(i = 0; i < primes.size(); i++){
28.         for(j = i+1; j < primes.size(); j++){ // loop through primes
29.             if(isPerm(primes[i], primes[j])) // see if they are permutations
30.             {
31.                 diff = primes[j]-primes[i];           // see if the next term in the sequence
32.                 if(isPerm(primes[j], primes[j]+diff)) // is also a permutation
33.                     if(find(primes.begin(), primes.end(), primes[j]+diff) != primes.end()){ // see if number is a prime
34.                         cout << primes[i] << primes[j] << primes[j]+diff << endl;
35.                         t2 = clock();
36.                         float seconds = ((float)t2-(float)t1)/CLOCKS_PER_SEC;
37.                         cout << seconds << "s" << endl;
38.                         return 0;
39.                     }
40.             }
41.         }
42.     }
43.     return 0;
44. }
45.
46. bool isPerm(int a, int b)
47. {
48.     stringstream as,bs;
49.     string astr, bstr;
50.     as << a;
51.     bs << b;
52.     astr = as.str();
53.     bstr = bs.str();
54.     sort(astr.begin(), astr.end());
55.     sort(bstr.begin(), bstr.end());
56.     return astr==bstr;
57. }
RAW Paste Data

# Adblocker detected! Please consider disabling it...

We've detected AdBlock Plus or some other adblocking software preventing Pastebin.com from fully loading.

We don't have any obnoxious sound, or popup ads, we actively block these annoying types of ads!

Please add Pastebin.com to your ad blocker whitelist or disable your adblocking software.

×