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  1. /**   
  2.  *  In the name of Allah, Most Gracious​, Most Merciful
  3. **/
  4.  
  5. #include<bits/stdc++.h>
  6. using namespace std;
  7.  
  8. #define no cout << "NO\n"
  9. #define yes cout << "YES\n"
  10. #define sz(x) (int)x.size()
  11. #define all(x) x.begin(), x.end()
  12. #define rall(x) x.rbegin(), x.rend()
  13. #define ers(x) x.erase(unique(all(x)), x.end())
  14. #define space " "
  15. #define nl "\n"
  16.  
  17. #define inmx INT_MAX
  18. #define lnmx LLONG_MAX
  19. #define inmn INT_MIN
  20. #define lnmn LLONG_MIN
  21. typedef long long ll;
  22. double pi = acos(-1);
  23. const int MXN = 1e5 + 5;
  24. const long long mod = 1e9 + 7;
  25.  
  26. void printv(vector<ll> v, ll n){
  27.     for(ll i = 0;i < n;i++){
  28.         cout << v[i] << space;
  29.     }
  30. }
  31.  
  32. vector<ll> inputv(vector<ll> v, ll n){
  33.     for(ll i = 0;i < n;i++){
  34.         ll y; cin >> y;
  35.         v.push_back(y);
  36.     }
  37.     return v;
  38. }
  39.  
  40. void solve(){
  41. 	int n; cin >> n;
  42. 	vector<int> v;
  43. 	int cnt = 0;
  44. 	for(int i = 0;i < n;i++){
  45. 		int x; cin >> x;
  46. 		if(x % 2 != i % 2){
  47. 			cnt++;
  48. 		}
  49. 	}
  50. 	if(cnt % 2 != 0){
  51. 		cout << -1 << nl;
  52. 		return;
  53. 	}
  54. 	cout << cnt/2 << nl;
  55. }
  56.  
  57. int main() {
  58.     ios_base::sync_with_stdio(false);
  59.     cin.tie(NULL);
  60.     cout.tie(NULL);
  61.  
  62.     int t; cin >> t;
  63.     while(t--){
  64.         solve();
  65.     }
  66.     return 0;
  67. }
  68.  
  69.  
Success #stdin #stdout 0.01s 5524KB
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https://ideone.com/7gwjPx
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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