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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define hey(x) cerr << #x << " is " << x << endl;
  5. #define int long long int
  6. #define ll long long
  7. #define vi vector<int>
  8. #define vvi vector<vector<int> >
  9. #define vpi vector<pair<int, int> >
  10. #define vvpi vector<vector<pair<int, int> > >
  11. #define all(v) (v).begin(), (v).end()   
  12. #define pii pair<int, int>
  13. #define pb push_back
  14. #define SZ(x) (int)(x).size();
  15. #define F first
  16. #define S second
  17. #define PI 3.1415926535897932384626
  18. #define out cout << fixed << setprecision(12)
  19. #define fast ios::sync_with_stdio(false); cin.tie(0);
  20. #define inf 1e12
  21.  
  22. const int N = 2e6 + 10;
  23. const int mod = 1e9 + 7;
  24. const double pi = acos(-1);
  25.  
  26. int f[N + 1][2];
  27.  
  28. int add(int a, int b) {
  29.     a += b;
  30.     if(a >= mod)
  31.         return a - mod;
  32.     return a;
  33. }
  34.  
  35. void compute() {
  36.  
  37.     f[3][0] = 0;
  38.     f[3][1] = 4;
  39.  
  40.     // f[i][0] : Not considering root in coloring
  41.     // f[i][1] : Considering root to Color
  42.  
  43.     for(int i = 4; i < N; ++i) {
  44.         int val = (f[i - 2][1] << 1) % mod;
  45.         int val2 = (f[i - 1][1]) % mod;
  46.  
  47.         f[i][0] = (val + val2) % mod;
  48.  
  49.         val = (f[i - 2][0] << 1) % mod;
  50.         val2 = (f[i - 1][0]) % mod;
  51.         f[i][1] = (4 + val2 + val) % mod;
  52.     }
  53. }
  54. void go() {
  55.     int n;
  56.     cin >> n;
  57.     cout << max(f[n][0], f[n][1]) << '\n';
  58.     return;
  59. }
  60.  
  61. int32_t main(){
  62.     ios::sync_with_stdio(false);
  63.     cin.tie(0);
  64.  
  65.     int t;
  66.     cin >> t;
  67.     compute();
  68.     while(t--) {
  69.         go();
  70.     }
  71.     return 0;
  72. }
Runtime error #stdin #stdout 0.03s 34488KB
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https://ideone.com/RyTb1E
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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