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Vince14

/<> 2517 (top down segment tree)

Sep 21st, 2023
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C++ 1.74 KB | Source Code | 0 0
  1. #include <iostream>
  2. #include <string>
  3. #include <cstring>
  4. #include <algorithm>
  5. #include <cmath>
  6. #include <vector>
  7. #include <set>
  8. #include <map>
  9. #include <stack>
  10. #include <queue>
  11. #include <deque>
  12. #include <unordered_map>
  13. #include <numeric>
  14. #include <iomanip>
  15. using namespace std;
  16. #define pii pair<long long, long long>
  17. #define ll long long
  18. #define FAST ios_base::sync_with_stdio(false); cin.tie(NULL)
  19. const long long dx[4] = {0, 1, 0, -1}, dy[4] = {1, 0, -1, 0};
  20. const long long dl[2] = {1, -1};
  21. const long long MOD = 1000000007;
  22. const long long MAXN = 500005;
  23.  
  24. int N;
  25. int before[MAXN], arr[MAXN], seg[MAXN * 4], loc[MAXN], best[MAXN];
  26. vector<int> tmp;
  27.  
  28. void update(int x, int s, int e, int idx, int val){
  29.     if(idx < s or idx > e) return;
  30.     if(s == e){
  31.         seg[x] = val;
  32.         return;
  33.     }
  34.     int mid = (s + e)/2;
  35.     update(x * 2, s, mid, idx, val);
  36.     update(x * 2 + 1, mid + 1, e, idx, val);
  37.     seg[x] = seg[x * 2] + seg[x * 2 + 1];
  38. }
  39.  
  40. int query(int x, int s, int e, int a, int b){
  41.     if(b < s or e < a) return 0;
  42.     if(a <= s and e <= b) return seg[x];
  43.     int mid = (s + e)/2;
  44.     return query(x * 2, s, mid, a, b) + query(x * 2 + 1, mid + 1, e, a, b);
  45. }
  46.  
  47. int main() {
  48.     FAST;
  49.     cin >> N;
  50.     for(int i = 1; i <= N; i++){
  51.         cin >> before[i];
  52.         tmp.push_back(before[i]);
  53.     }
  54.     sort(tmp.begin(), tmp.end());
  55.     for(int i = 1; i <= N; i++){
  56.         arr[i] = (int) (std::lower_bound(tmp.begin(), tmp.end(), before[i]) - tmp.begin()) + 1;
  57.         loc[arr[i]] = i;
  58.     }
  59.     for(int i = 1; i <= N; i++){
  60.         best[i] = loc[i] - query(1, 1, N, 1, loc[i] - 1);
  61.         update(1, 1, N, loc[i], 1);
  62.     }
  63.     for(int i = 1; i <= N; i++){
  64.         cout << best[arr[i]] << "\n";
  65.     }
  66. }
  67.  
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