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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void executeTime() {
  5.     cerr << "Time Taken: " << (float)clock() / CLOCKS_PER_SEC << " secs";
  6. }
  7.  
  8. int main() {
  9.  
  10.  
  11.     int n; cin >> n;
  12.  
  13.     vector<int> a(n), b(n);
  14.     for (auto &x : a) {
  15.         cin >> x;
  16.     }
  17.  
  18.     for (auto &x : b) {
  19.         cin >> x;
  20.     }
  21.  
  22.     vector<array<int, 2>> dp_a(n, array<int, 2> ({0, 0})), dp_b(n, array<int, 2> ({0, 0}));
  23.  
  24.     int p = 0;
  25.     if (a[0] & 1) p = 1;
  26.  
  27.     dp_a[0][p] = 1;
  28.  
  29.     p = 0;
  30.     if (b[0] & 1) p = 1;
  31.     dp_b[0][p] = 1;
  32.  
  33.     for (int i = 1; i < n; i++) {
  34.         if (a[i] & 1) {
  35.             dp_a[i][0] = dp_a[i - 1][1] + dp_b[i - 1][1];
  36.             dp_a[i][1] = dp_a[i - 1][0] + dp_b[i - 1][0];
  37.         } else {
  38.             dp_a[i][0] = dp_a[i - 1][0] + dp_b[i - 1][0];
  39.             dp_a[i][1] = dp_a[i - 1][1] + dp_b[i - 1][1];
  40.         }
  41.  
  42.         if (b[i] & 1) {
  43.             dp_b[i][0] = dp_a[i - 1][1] + dp_b[i - 1][1];
  44.             dp_b[i][1] = dp_a[i - 1][0] + dp_b[i - 1][0];
  45.         } else {
  46.             dp_b[i][0] = dp_a[i - 1][0] + dp_b[i - 1][0];
  47.             dp_b[i][1] = dp_a[i - 1][1] + dp_b[i - 1][1];
  48.         }
  49.     }
  50.  
  51.     cout << dp_a[n - 1][0] + dp_b[n - 1][0] << endl;
  52.  
  53.     executeTime();
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout #stderr 0.01s 5292KB
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Time Taken: 0.005147 secs
https://ideone.com/afnUXe
language:
C++14 (gcc 8.3)
created:
14 hours ago
visibility:
public

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