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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int main() {
  6. int n, k, tmp, n2, i;
  7. scanf("%d%d", &n, &k);
  8. tmp=n-n/k;
  9. n2=n;
  10. while(n2>0) {
  11. n2=n, i=tmp;
  12. while(i>0) n2-=i, i/=k;
  13. if(n2>0) tmp++;
  14. }
  15. printf("%d", tmp);
  16. return 0;
  17. }
Success #stdin #stdout 0s 3300KB
stdin
7 2
stdout
4