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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. inline int power(int a, int b) {
  6.     int x = 1;
  7.     while (b) {
  8.         if (b & 1) x *= a;
  9.         a *= a;
  10.         b >>= 1;
  11.     }
  12.     return x;
  13. }
  14.  
  15.  
  16. const int M = 1000000007;
  17. const int N = 3e5+9;
  18. const int INF = 2e9+1;
  19. const int LINF = 2000000000000000001;
  20.  
  21. //_ ***************************** START Below *******************************
  22.  
  23.  
  24.  
  25. vector<int> a;
  26. void consistency(int n) {
  27.  
  28. 	int s = 0, e = n-1;
  29. 	int curr = s;
  30. 	int p1 = 0, p2 = 0;
  31. 	int toggle = 1;
  32.  
  33. 	//* keep in mind => s < e (not s<=e)
  34. 	while(s<e){
  35. 		if(toggle){
  36. 			p1 += a[curr];
  37. 		}	
  38. 		else{
  39. 			p2 += a[curr];
  40. 		}
  41. 		bool isEven = (a[curr] & 1) ? false : true;
  42. 		if(curr == s){
  43. 			s++;
  44. 			curr = s;
  45. 		}
  46. 		else{
  47. 			e--;
  48. 			curr = e;
  49. 		}
  50. 		if(isEven){
  51. 			if(curr == s) curr = e;
  52. 			else curr = s;
  53. 		}
  54. 		toggle ^= 1;
  55. 	}
  56.  
  57. 	cout << p1-p2 << endl;
  58.  
  59. }
  60.  
  61. void solve() {
  62.  
  63.     int n;
  64.     cin >> n;
  65.     a.resize(n);
  66.  
  67.     for(int i=0; i<n; i++) cin >> a[i];
  68.  
  69.     consistency(n) ;
  70.  
  71. }
  72.  
  73.  
  74.  
  75.  
  76.  
  77. int32_t main() {
  78.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  79.  
  80.     int t = 1;
  81.     while (t--) {
  82.         solve();
  83.     }
  84.  
  85.     return 0;
  86. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/h03jmU
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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