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  1. #include <stdio.h>
  2. #include <algorithm>
  3. #include <vector>
  4. using namespace std;
  5.  
  6.  
  7. class SegmentTree {
  8.  
  9.     int sz;
  10.     vector<int> t;
  11.  
  12.     int query(int v, int vl, int vr, int l, int r) const {
  13.         if (r < vl || vr < l)
  14.             return 0;
  15.         if (l <= vl && vr <= r)
  16.             return t[v];
  17.         int vm = vl + (vr - vl) / 2;
  18.         int ql = query(2 * v + 1, vl, vm, l, r);
  19.         int qr = query(2 * v + 2, vm + 1, vr, l, r);
  20.         return ql + qr;
  21.     }
  22.  
  23.     void modify(int v, int vl, int vr, int pos, int val) {
  24.         if (vl == vr) {
  25.             t[v] += val;
  26.             return;
  27.         }
  28.         int vm = vl + (vr - vl) / 2;
  29.         if (pos <= vm)
  30.             modify(2 * v + 1, vl, vm, pos, val);
  31.         else
  32.             modify(2 * v + 2, vm + 1, vr, pos, val);
  33.         t[v] = t[2 * v + 1] + t[2 * v + 2];
  34.     }
  35.  
  36. public:
  37.  
  38.     SegmentTree(const vector<int> &a) {
  39.         sz = a.size();
  40.         t.resize(4 * sz);
  41.     }
  42.  
  43.     int query(int l, int r) const {
  44.         return query(0, 0, sz - 1, l, r);
  45.     }
  46.  
  47.     void modify(int pos, int val) {
  48.         modify(0, 0, sz - 1, pos, val);
  49.     }
  50.  
  51. };
  52.  
  53.  
  54. class Event {
  55.  
  56.     int type, index, xl, xr, y;
  57.  
  58. public:
  59.  
  60.     Event(int type, int index, int xl, int xr, int y) : type(type), index(index), xl(xl), xr(xr), y(y) {}
  61.  
  62.     bool operator < (const Event &that) const {
  63.         return y > that.y || y == that.y && type < that.type;
  64.     }
  65.  
  66.     void process(SegmentTree &st, vector<int> &answers) const {
  67.         if (type == 1)
  68.             answers[index] = st.query(xl, xr);
  69.         if (type == 2)
  70.             st.modify(xl, 1);
  71.     }
  72.  
  73. };
  74.  
  75.  
  76. int main() {
  77.     vector<Event> scanLine;
  78.  
  79.     int aSize;
  80.     scanf("%d", &aSize);
  81.  
  82.     vector<int> a(aSize);
  83.     for (int i = 0; i < aSize; i++) {
  84.         scanf("%d", &a[i]);
  85.         scanLine.push_back(Event(2, -1, i, -1, a[i]));
  86.     }
  87.  
  88.     SegmentTree st(a);
  89.  
  90.     int queriesCount;
  91.     scanf("%d", &queriesCount);
  92.  
  93.     for (int i = 0; i < queriesCount; i++) {
  94.         int l, r, k;
  95.         scanf("%d%d%d", &l, &r, &k);
  96.         scanLine.push_back(Event(1, i, l, r, k));
  97.     }
  98.  
  99.     vector<int> answers(queriesCount);
  100.     sort(scanLine.begin(), scanLine.end());
  101.     for (int i = 0; i < scanLine.size(); i++)
  102.         scanLine[i].process(st, answers);
  103.  
  104.     for (int i = 0; i < queriesCount; i++)
  105.         printf("%d\n", answers[i]);
  106. }
Success #stdin #stdout 0s 3488KB
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https://ideone.com/wCdmq9
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
secret

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