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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. int n;
  6. cin>>n;
  7. int liczby[n];
  8. for(int i=0; i<n; i++)
  9. cin>>liczby[i];
  10. int ile=0;
  11. for(int i=n-2; i>-1; i--){
  12. 	if(liczby[i]>=liczby[i+1]){
  13.  
  14.  
  15. 	liczby[i]=liczby[i+1]-1;
  16. 	ile++;}
  17. 	if(liczby[i]<1){
  18. 		cout<<-1;
  19. 		return 0;
  20. 	}
  21. }
  22. cout<<ile;
  23. return 0;
  24. }
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/AhJ4Y1
language:
C++14 (gcc 8.3)
created:
6 hours ago
visibility:
public

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