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#include <iostream> using namespace std; int main() { long long z; long long c; cin>>z>>c; long long k=1; long long k1=c-1; for(int k2=0; k2<k1; k2++){ k*=10; } long long s=k; long long e=k*10-1; while(s<=e){ long long middle=(e+s)/2; long long middle1=middle; long long z1=0; while (middle1>0){ z1+=middle1; middle1/=10; } if(z1==z){ cout<<middle; return 0; } if(z1<z){ s=middle+1; } if(z1>z){ e=middle-1; } } return 0; }
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