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  1. #include<bits/stdc++.h>
  2. //using namespace std;
  3. int main() {
  4. 	int i, p, q, r, s;
  5. 	while (scanf("%d %d %d %d", &p, &q, &r, &s) == 4) {
  6. 		long double ans = 0;
  7. 		if (p - q < q)
  8. 			q = p - q;
  9. 		if (r - s < s)
  10. 			s = r - s;
  11. 		for (i = 1; i <= q; i++)
  12. 			ans += log(p - q + i) - log(i);
  13. 		for (i = 1; i <= s; i++)
  14. 			ans -= log(r - s + i) - log(i);
  15. 		printf("%.5lf\n", exp(ans));
  16. 	}
  17. 	return 0;
  18. }
  19.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
10 5 14 9
93 45 84 59
145 95 143 92
995 487 996 488
2000 1000 1999 999
9998 4999 9996 4998
stdout 
0.12587
505606.46055
1.28223
0.48996
2.00000
3.99960
https://ideone.com/x7n5cm
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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