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#include <iostream> #include <queue> #include <vector> using namespace std; typedef long long ll; int main() { ll Z, C; cin >> Z >> C; ll L = 1, R = 1; for(int i = 0; i < C; i++) { L *= 10; R *= 10; } L /= 10; R -= 1; while(L <= R) { ll middle = (L + R) / 2; ll number = middle; ll sum = number; while(number > 0) { number /= 10; sum += number; } if(sum == Z) { cout << middle << endl; return 0; } if(sum < Z) { L = middle + 1; } else { R = middle - 1; } } return 0; }
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