1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
#include <algorithm>
#include <iomanip>
#include <iterator>
#include <iostream>
#include <numeric>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
struct CommaInts : string {
friend istream& operator>>(istream& is, CommaInts& line) {
return getline(is, line, ',');
}
operator int() const { return stoi(*this); }
};
auto begin(istream_iterator<CommaInts>& l) { return l; }
auto end(istream_iterator<CommaInts>&) { return istream_iterator<CommaInts>{}; }
template <typename T>
auto knothash(T iter, int n)
{
vector<int> v(256);
iota(begin(v), end(v), 0);
uint8_t skip = 0, pos = 0, delta;
for (int j = 0; j < n; j++)
for (auto i : iter) {
reverse(begin(v), begin(v) + i);
delta = i + skip++;
rotate(begin(v), begin(v) + delta, end(v));
pos += delta;
}
rotate(begin(v), end(v) - pos, end(v));
return move(v);
}
int
main() {
string line;
cin >> line;
istringstream iss{line};
vector<int> v1{knothash(istream_iterator<CommaInts>(iss), 1)};
cout << v1[0] * v1[1] << endl;
line.append({17,31,73,47,23});
vector<int> v2{knothash(line, 64)};
for (auto b = begin(v2); b != end(v2); advance(b, 16))
cout << setfill('0') << setw(2) << hex <<
accumulate(b, b + 16, 0, bit_xor<uint8_t>());
cout << endl;
}
|
