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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int n,m;
  7. 	long long f,f1=1,f2=1,p=1000000007;
  8. 	cin >> n >> m;
  9. 	if (abs(n-m)>1) cout << "0";
  10. 	else if (n==m) {
  11. 		for (int i=1; i<=n; i++) {
  12. 			f1=f1*i;
  13. 			if (f1>p) f1=f1%p;
  14. 		}
  15. 		for (int j=1; j<=m; j++) {
  16. 			f2=f2*j;
  17. 			if (f2>p) f2=f2%p;
  18. 		}
  19. 		f=2*f1*f2;
  20. 		if (f>p) f=f%p;
  21. 		cout << f;
  22. 	} else {
  23. 		for (int i=1; i<=n; i++) {
  24. 			f1=f1*i;
  25. 			if (f1>p) f1=f1%p;
  26. 		}
  27. 		for (int j=1; j<=m; j++) {
  28. 			f2=f2*j;
  29. 			if (f2>p) f2=f2%p;
  30. 		}
  31. 		f=f1*f2;
  32. 		if (f>p) f=f%p;
  33. 		cout << f;
  34. 	}
  35. 	return 0;
  36. }
Success #stdin #stdout 0s 15232KB
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stdin
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99999 100000
stdout
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768947656
https://ideone.com/rVTrTD
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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