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  1. //  R. Cell Borders
  2. #define DaAbyad ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  3. #include<bits/stdc++.h>
  4. using namespace std;
  5. const int N = 1e5 + 5, MOD = 1e9 + 7;
  6. const long long oo = 1e18 + 5;
  7. const long double pi = acos(-1);
  8. const long double eps = 1e-9;
  9. void open_file(string filename) {
  10.   freopen((filename + ".in").c_str(), "r", stdin);
  11.   freopen((filename + ".out").c_str(), "w", stdout);
  12. }
  13.  
  14. void Magic() {
  15.   int n;
  16.   cin >> n;
  17.   int a[n];
  18.   for (int i = 0; i < n; ++i) {
  19.     cin >> a[i];
  20.   }
  21.   int l = 0, r = 1;
  22.   bool flag1 = false, flag2 = false;
  23.   for (int i = 0; i < n; ++i) {
  24.     l = a[i] - l;
  25.     r = a[i] - r;
  26.     if (l < 0 || l > 1) {
  27.       flag1 = true;
  28.     }
  29.     if (r < 0 || r > 1) {
  30.       flag2 = true;
  31.     }
  32.     if (flag1 && flag2) {
  33.       cout << "No\n";
  34.       return;
  35.     }
  36.   }
  37.   cout << "Yes\n";
  38. }
  39.  
  40. int main() {
  41.   DaAbyad
  42.   int tests = 1;
  43.   // cin >> tests;
  44.   while (tests--) {
  45.     Magic();
  46.   }
  47.   return 0;
  48. }
Success #stdin #stdout 0s 5280KB
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stdin
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Standard input is empty
stdout
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Yes
https://ideone.com/5cj0yE
language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

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