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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. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6.  
  7.  
  8. const int M = 1000000007;
  9. const int N = 3e5+9;
  10. const int INF = 2e9+1;
  11. const int LINF = 2000000000000000001;
  12.  
  13. inline int power(int a, int b, int mod=M) {
  14.     int x = 1;
  15.     a %= mod;
  16.     while (b) {
  17.         if (b & 1) x = (x * a) % mod; 
  18.         a = (a * a) % mod;
  19.         b >>= 1;
  20.     }
  21.     return x;
  22. }
  23.  
  24.  
  25. //_ ***************************** START Below *******************************
  26.  
  27. // 7
  28. // 5 8 8 10 12 13 14
  29.  
  30.  
  31. vector<int> a;
  32.  
  33. int consistency(int n){
  34.  
  35.  
  36. 	int ans = a[0];
  37.  
  38. 	int last = a[0];
  39. 	int len = 1;
  40. 	int lastDif = 0;
  41.  
  42. 	for(int i=1; i<n; i++){
  43.  
  44. 		int diff = a[i] - a[i-1];
  45.  
  46. 		if(diff == lastDif){
  47. 			len++;
  48. 			last = len*a[i] + last;
  49. 			ans += last;
  50. 		}
  51. 		else{
  52. 			len = 2;
  53.  
  54. 			last = 2*a[i] + a[i-1];
  55. 			ans += last;
  56.  
  57. 			lastDif = diff;
  58. 		}
  59. 	}
  60.  
  61.  
  62. 	return ans;
  63. }
  64.  
  65.  
  66.  
  67.  
  68.  
  69.  
  70.  
  71.  
  72.  
  73.  
  74. int practice(int n){
  75.  
  76.  
  77.     return 0;
  78. }
  79.  
  80.  
  81.  
  82.  
  83.  
  84. void solve() {
  85.  
  86.     int n;
  87.     cin>> n;
  88.  
  89.     a.resize(n);
  90.     for(int i=0; i<n; i++) cin >> a[i];
  91.  
  92.     cout << consistency(n) << endl;
  93.  
  94.  
  95. }
  96.  
  97.  
  98.  
  99.  
  100.  
  101. int32_t main() {
  102.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  103.  
  104.     int t = 1;
  105.     // cin >> t;
  106.     while (t--) {
  107.         solve();
  108.     }
  109.  
  110.     return 0;
  111. }
Success #stdin #stdout 0.01s 5332KB
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stdin
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7
5 8 8 10 12 13 14
stdout
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260
https://ideone.com/uBt3S4
language:
C++14 (gcc 8.3)
created:
16 hours ago
visibility:
public

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