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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int n, a, r, b;
  7. 	const int md=1e9+7;
  8. 	r=1, b=0;
  9. 	scanf("%d", &n);
  10. 	for(int i=0; i<n; i++) {scanf("%d", &a); if(a & 1) b++;}
  11. 	if(b==0) n++;
  12. 	for(int i=1; i<n; i++) r<<=1, r%=md;
  13. 	printf("%d", r-1);
  14. 	return 0;
  15. }
Success #stdin #stdout 0s 3300KB
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stdin
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10
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stdout
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511
https://ideone.com/kGDyWm
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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