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#include <iostream> #include <vector> using namespace std; int n; int main() { int n; cin >> n; string s; cin >> s; int combs = 0; for(int mask = 0; mask < (1 << n); mask++) { string tmp = ""; for(int i = 0; i < n; i++) { if(mask & (1 << i)) { tmp += s[i]; } } string ltd = ""; if(tmp.size() == 1) { ltd += tmp[tmp.size() - 1]; } else if(tmp.size() == 2) { ltd += tmp[tmp.size() - 2]; ltd += tmp[tmp.size() - 1]; } else { ltd += tmp[tmp.size() - 3]; ltd += tmp[tmp.size() - 2]; ltd += tmp[tmp.size() - 1]; } int num = 0; for(int j = 0; j < ltd.size(); j++) { num = (num * 10) + (ltd[j] - '0'); } if(num % 8 == 0) { ++combs; } } cout << combs - 1<< endl; return 0; }
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