魈凯KBS • 5个月前
using namespace std; int main(void) {
int a,n; unsigned long long sum=0; cin>>a>>n; for(int i=1,num;i<=n;i++) {
num=a; for(int j=2;j<=i;j++)num=num*10+a; sum+=num;
} cout<<sum; return 0; }
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