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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.  
  27.  
  28. int consistency(int n) {
  29.  
  30. 	int s = 0;
  31. 	int e = n-1;
  32. 	int turn = 0;
  33. 	bool rev = false;
  34.  
  35. 	int p1 = 0;
  36. 	int p2 = 0;
  37.  
  38. 	while(s<=e){
  39.  
  40. 		int val;
  41. 		if(rev){
  42. 			val = a[e];
  43. 			e--;
  44. 		}
  45. 		else{
  46. 			val = a[s];
  47. 			s++;
  48. 		}
  49.  
  50. 		if( !(val & 1)){
  51. 			rev = !rev;
  52. 		}
  53.  
  54. 		if(turn == 0){
  55. 			p1 += val;
  56. 		}
  57. 		else p2 += val;
  58.  
  59. 		turn ^= 1;
  60.  
  61. 	}
  62.  
  63. 	return p1-p2;
  64.  
  65. }
  66.  
  67.  
  68.  
  69.  
  70.  
  71.  
  72.  
  73.  
  74.  
  75.  
  76.  
  77.  
  78. int practice(int n) {
  79.  
  80.  
  81. }
  82.  
  83.  
  84.  
  85. void solve() {
  86.  
  87.     int n;
  88.     cin >> n;
  89.  
  90.     a.resize(n);
  91.     for(int i=0; i<n; i++) cin >> a[i];
  92.  
  93.     cout << consistency(n) << endl;
  94.  
  95.  
  96.     // cout << consistency(n) << " -> " << practice(n) << endl;
  97.  
  98. }
  99.  
  100.  
  101.  
  102.  
  103.  
  104. int32_t main() {
  105.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  106.  
  107.     int t = 1;
  108.     while (t--) {
  109.         solve();
  110.     }
  111.  
  112.     return 0;
  113. }
Success #stdin #stdout 0s 5324KB
comments (?)
stdin 
4
2 1 4 3
stdout 
2
https://ideone.com/t8zEv5
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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