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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int Mod(int x, int m) {
  6. 	x = (x % m);
  7. 	if (x < 0) {
  8. 		x += m;
  9. 	}
  10. 	return x;
  11. }
  12.  
  13. int main() {
  14. 	ios_base::sync_with_stdio(0);
  15. 	cin.tie(0);
  16.  
  17. 	int n, c, ci, s;
  18. 	int pos = 0, cnt = 0;
  19. 	cin >> n >> c >> s;
  20. 	--s;
  21. 	if (pos == s) {
  22. 		++cnt;
  23. 	}
  24. 	for (int i = 0; i < c; ++i) {
  25. 		cin >> ci;
  26. 		pos += ci;
  27. 		pos = Mod(pos, n);
  28. 		if (pos == s) {
  29. 			++cnt;
  30. 		}
  31. 	}
  32. 	cout << cnt << '\n';
  33.  
  34. 	return 0;
  35. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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2 2 1
-1 -1
stdout
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2
https://ideone.com/9Cm3jZ
language:
C++14 (gcc 8.3)
created:
284 days ago
visibility:
public

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