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#include <iostream> #include <cmath> using namespace std; int main() { string s; cin >> s; int k; cin >> k; int n = s.size(); string result = ""; for(int mask = 0; mask < (1 << n); mask++) { int bitcount = 0; string tmp = ""; for(int i = 0; i < n; i++) { if(mask & (1 << i)) { bitcount++; } else { tmp += s[i]; } } if(bitcount == k) { result = max(result, tmp); } } cout << result << endl; return 0; }
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