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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. const int maxn = 2e5 + 42, mod = 1e9 + 7;
  6.  
  7. int bpow(int x, int n) {
  8. 	return n ? n % 2 ? 1LL * x * bpow(x, n - 1) % mod : bpow(1LL * x * x % mod, n / 2) : 1;
  9. }
  10. int inv(int x) {
  11. 	return bpow(x, mod - 2);
  12. }
  13.  
  14. int F[maxn];
  15. int fact(int n) {
  16. 	return n ? F[n] ? F[n] : F[n] = 1LL * n * fact(n - 1) % mod : 1;
  17. }
  18. int rfact(int n) {
  19. 	return inv(fact(n));
  20. }
  21. int nCr(int n, int r) {
  22. 	return 1LL * fact(n) * rfact(r) % mod * rfact(n - r) % mod;
  23. }
  24.  
  25. void solve() {
  26. 	int N;
  27. 	cin >> N;
  28. 	string A, B;
  29. 	cin >> A >> B;
  30. 	int Na = count(begin(A), end(A), '1');
  31. 	int Nb = count(begin(B), end(B), '1');
  32. 	int ans = 0;
  33. 	int L = abs(Na - Nb);
  34. 	int R = Na + Nb - 2 * max(0, Na + Nb - N);
  35. 	for(int k = L; k <= R; k += 2) {
  36. 		ans = (ans + nCr(N, k)) % mod;
  37. 	}
  38. 	cout << ans << endl;
  39. }
  40.  
  41. signed main() {
  42. 	//freopen("input.txt", "r", stdin);
  43. 	int t;
  44. 	cin >> t;
  45. 	while(t--) {
  46. 		solve();
  47. 	}
  48. }
  49.  
Success #stdin #stdout 0.05s 4520KB
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https://ideone.com/17SXjY
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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