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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6. inline int power(int a, int b) {
  7.     int x = 1;
  8.     while (b) {
  9.         if (b & 1) x *= a;
  10.         a *= a;
  11.         b >>= 1;
  12.     }
  13.     return x;
  14. }
  15.  
  16.  
  17. const int M = 1000000007;
  18. const int N = 3e5+9;
  19. const int INF = 2e9+1;
  20. const int LINF = 2000000000000000001;
  21.  
  22. //_ ***************************** START Below *******************************
  23.  
  24. vector<int> a;
  25.  
  26. int consistency(int n){
  27.  
  28. 	vector<int> b;
  29. 	unordered_set<int> st;
  30. 	for(int i=0; i<n; i++){
  31. 	    if(!st.count(a[i])){
  32. 		    b.push_back(abs(a[i]));
  33. 	    }
  34. 	    st.insert(a[i]);
  35. 	}
  36. 	sort(begin(b), end(b));
  37.  
  38. 	int m = b.size();
  39.  
  40. 	int ans = 0;
  41. 	for(int i=0; i<m-1; i++){
  42. 		int j = upper_bound(begin(b)+i+1, end(b), 2*b[i] ) - begin(b);
  43.  
  44. 		ans += (j-1)-i;
  45. 	}
  46.  
  47. 	return ans;
  48. }
  49.  
  50.  
  51.  
  52.  
  53.  
  54.  
  55.  
  56.  
  57.  
  58.  
  59. void solve() {
  60.  
  61.     int n;
  62.     cin>>n;
  63.     a.resize(n);
  64.  
  65.     for(int i=0; i<n; i++) cin >> a[i];
  66.     cout << consistency(n) << endl;
  67.  
  68.  
  69. }
  70.  
  71.  
  72.  
  73.  
  74.  
  75.  
  76. int32_t main() {
  77.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  78.  
  79.     int t = 1;
  80.     // cin >> t;
  81.     while (t--) {
  82.         solve();
  83.     }
  84.  
  85.     return 0;
  86. }
Success #stdin #stdout 0.01s 5324KB
comments (?)
stdin 
5
-1 2 1 -1 1 
3
2 5 -3
2
3 6
3
0 100 -100
stdout 
3
https://ideone.com/i9P8QS
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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