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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. #define N 500005
  4.  
  5. using namespace std;
  6.  
  7. int n;
  8. ll X[N],k;
  9.  
  10. ll power(ll x,ll POWER,ll MOD)
  11. {
  12. 	ll ret=1;
  13. 	while(POWER>0){
  14. 		if(POWER&1)
  15. 			ret=(ret*x)%MOD;
  16. 		x=(x*x)%MOD;
  17. 		POWER>>=1;
  18. 	}
  19. 	return ret%=MOD;
  20. }
  21.  
  22. void init()
  23. {
  24. 	for(int i=0;i<n;++i)
  25. 		cin >> X[i];
  26. 	cin >> k;
  27. }
  28.  
  29. ll dfs(ll now,ll MOD)
  30. {
  31. 	if(now==n-1)
  32. 		return X[now];
  33.  
  34. 	ll nextMOD=MOD,tmp=MOD;
  35. 	for(ll i=2;i*i<=tmp;++i){
  36. 		if(tmp%i==0)
  37. 			nextMOD=nextMOD/i*(i-1);
  38. 		while(tmp%i==0){
  39. 			tmp/=i;
  40. 		}
  41. 	}
  42. 	if(tmp!=1)
  43. 		nextMOD=nextMOD/tmp*(tmp-1);
  44. 	return power(X[now],dfs(now+1,nextMOD),MOD);
  45. }
  46.  
  47. int main()
  48. {
  49. 	ios_base::sync_with_stdio(false);
  50. 	cin.tie(nullptr);	cout.tie(nullptr);
  51.  
  52. 	while(cin >> n && n!=0){
  53. 		init();
  54. 		cout << dfs(0,k) << endl;
  55. 	}
  56.  
  57. 	return 0;
  58. }
  59.  
Success #stdin #stdout 0s 4520KB
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https://ideone.com/gYneXP
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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