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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int n;
  6. char a[1<<17];
  7. int cnt[2048];
  8. long long ans;
  9. int parity[16];
  10.  
  11. int main() {
  12. 	int i,j,current_mask;
  13.  
  14. 	scanf("%d", &n);
  15. 	scanf("%s", a+1);
  16.  
  17. 	++cnt[0];
  18. 	for(i=1;i<=n;i++) {
  19. 		parity[a[i]-'0']^=1;
  20. 		current_mask=0;
  21. 		for(j=0;j<10;j++) if(parity[j]) current_mask|=(1<<j);
  22. 		ans+=cnt[current_mask];
  23. 		for(j=0;j<10;j++) ans+=cnt[current_mask^(1<<j)];
  24. 		++cnt[current_mask];
  25. 	}
  26.  
  27. 	printf("%lld\n", ans);
  28.  
  29. 	return 0;
  30. }
  31.  
Success #stdin #stdout 0s 3552KB
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https://ideone.com/1grO2A
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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