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  1. //Solution By SlavicG
  2. #include "bits/stdc++.h"
  3. using namespace std;
  4.  
  5. #define ll                          long long
  6.  
  7. #define forn(i,n)                   for(int i=0;i<n;i++)
  8. #define all(v)                      v.begin(), v.end()
  9. #define rall(v)                     v.rbegin(),v.rend()
  10.  
  11. #define pb                          push_back
  12. #define sz(a)                       (int)a.size()
  13.  
  14. #define fastio                      ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
  15. #define   endl                      "\n"
  16.  
  17. int gcd(int a, int b) 
  18. { 
  19.     if (a==0) return b; 
  20.     if (b == 0)return a; 
  21.     if (a == b)return a; 
  22.     if (a > b)return gcd(a-b, b); 
  23.     return gcd(a, b-a); 
  24. } 
  25. int main()
  26. {
  27. 	int n,k;
  28. 	cin >> n >> k;
  29. 	int a[n];
  30. 	for(int i = 0;i < n;i++)
  31. 		cin >> a[i];
  32.  
  33. 	if(k%2==0){
  34. 		cout << "NO\n";
  35. 		return 0;
  36. 	}
  37.  
  38. 	int prefixGcd[n],suffixGcd[n];
  39. 	prefixGcd[0] = a[0];
  40. 	suffixGcd[n-1] = a[n-1];
  41.  
  42. 	for(int i = 1 ;i < n;i++){
  43. 		prefixGcd[i] = gcd(prefixGcd[i-1],a[i]);
  44. 	}
  45. 	for(int i = n-2;i>=0;i--){
  46. 		suffixGcd[i] = gcd(suffixGcd[i+1],a[i]);
  47. 	}
  48.  
  49. 	for(int i = 1;i < n - 1 ;i++){
  50. 		if(gcd(prefixGcd[i-1], suffixGcd[i+1]) > 1){
  51. 			cout << "YES\n";
  52. 			return 0;
  53. 		}
  54. 	}
  55. 	//Check for the element at index 0 and for the element at index n-1.
  56. 	if(suffixGcd[1] > 1 || prefixGcd[n-2] > 1){
  57. 		cout << "YES\n"; 
  58. 		return 0;
  59. 	}
  60. 	cout << "NO\n";
  61. }
Time limit exceeded #stdin #stdout 5s 4516KB
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https://ideone.com/R5YyHC
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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