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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int i,j,n;	cin>>n;	int a[n+1];
  6. 	for(i=1;i<=n;i++)	cin>>a[i];
  7. 	if(n==1){
  8. 		cout<<(a[1]+1)%2;
  9. 		return 0;
  10. 	}
  11. 	int count=0;
  12. 	for(i=1;i<=n;i++){
  13. 		if(a[i]%2!=0)	continue;
  14. 		if(i==n)	break;
  15. 		count+=1;
  16. 		a[i]+=1;
  17. 		if(i==1)	a[2]+=1;
  18. 		else{
  19. 			a[i+1]+=1;
  20. 			if(i+2<=n)	a[i+2]+=1;
  21. 		}
  22. 	}
  23. 	if(i>n)	cout<<count;
  24. 	else	cout<<"-1";
  25. 	return 0;
  26. }
Success #stdin #stdout 0s 16064KB
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stdin
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4
5 6 7 4
stdout
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-1
https://ideone.com/7gtH3S
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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