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  1. #include<iostream>
  2. #include<cmath>
  3. using namespace std;
  4.  
  5. #define MOD 1000000007
  6.  
  7. long long a[1000000];
  8. long long c[1000000];
  9. long long y[1000000];
  10. long long z[1000000];
  11. long long result;
  12. long long d[31];
  13. long long res;
  14. int n, q, e, f;
  15.  
  16. int main() {
  17. 	cin >> n >> q;
  18. 	for (int i = 1; i <= n; i++) {
  19. 		cin >> a[i];
  20. 	}
  21. 	c[0] = 1;
  22. 	c[q + 1] = 1;
  23. 	for (int i = 1; i <= q; i++) {
  24. 		cin >> c[i];
  25. 	}
  26. 	for (int h = 2; h <= n; h++) {
  27. 		e = a[h - 1];
  28. 		f = a[h];
  29.  
  30. 		d[0] = e;
  31. 		for (int i = 1; i < 31; i++) {
  32. 			d[i] = (long long)(d[i - 1] * d[i - 1]) % MOD;
  33. 		}
  34. 		res = 1;
  35. 		for (int i = 0; i < 31; i++) {
  36. 			if (f % 2 == 1) {
  37. 				res *= d[i];
  38. 				res %= MOD;
  39. 			}
  40. 			f /= 2;
  41. 		}
  42. 		y[h] = res;
  43. 	}
  44. 	z[1] = 0;
  45. 	for (int i = 2; i <= n; i++) {
  46. 		z[i] = z[i - 1] + y[i];
  47. 	}
  48. 	result = 0;
  49. 	for (int i = 1; i <= q + 1; i++) {
  50. 		result += abs(z[c[i]] - z[c[i - 1]]);
  51. 		result %= MOD;
  52. 	}
  53. 	cout << result << endl;
  54. 	return 0;
  55. }
Success #stdin #stdout 0s 34712KB
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3 2
23 12 9
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stdout
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876796540
https://ideone.com/Z7JmqT
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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