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- #include <iostream>
- #include <cstring>
- using namespace std;
- int st[100], i, p;
- int Valid(int k)
- {
- if(st[1] != 0) return 0;
- for(i = 1; i < k; i++)
- if(st[i] == st[k])
- return 0;
- return 1;
- }
- void backtrack(int k)
- {
- if(k == p+1)
- {
- int z = 1, s = 0;
- for(i = 1; i <= p; i++)
- {
- s = z * s + st[i];
- z *= 10;
- }
- cout << s << " ";
- if(!(s % 4))
- cout << s << "\n";
- }
- else
- {
- st[k] = -1;
- while(st[k]++ < 9)
- if(Valid(k))
- backtrack(k+1);
- }
- }
- int main()
- {
- cin >> p;
- backtrack(1);
- return 0;
- }
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