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#include <iostream> using namespace std; int main() { long long z, c; cin >> z >> c; long long najmal = 1, najgolem; for(int i = 0; i < c - 1; i++) { najmal *= 10; } najgolem = najmal * 10 - 1; long long L = najmal, R = najgolem; long long zbir, broj; while(L <= R) { long long sredina = (L + R) / 2; broj = sredina; zbir = 0; while(broj > 0) { zbir += broj; broj /= 10; } if(zbir == z) { cout << sredina << endl; return 0; } if(zbir < z) { L = sredina + 1; } else { R = sredina - 1; } } return 0; }
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