Submission #752045

#	Time	Username	Problem	Language	Result	Execution time	Memory
752045		NeroZein	Examination (JOI19_examination)	C++17	100 / 100	1295 ms	95468 KiB

examination

#include "bits/stdc++.h"
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
 
#ifdef Nero
#include "Deb.h"
#else
#define deb(...)
#endif
 
const int N = 100005;
 
template <class T> using Tree = tree<T,null_type, less_equal<T>, rb_tree_tag,tree_order_statistics_node_update>;
 
Tree<int> tr[N]; 
 
void upd (int id, int v) {
  id++; 
  while (id < N) {
    tr[id].insert(v); 
    id += id & -id; 
  }
}
 
int qry (int id, int v) {
  id++; 
  int ret = 0; 
  while (id) {
    ret += tr[id].size() - tr[id].order_of_key(v);
    id -= id & -id;
  }
  return ret;
}
 
int qry (int l, int r, int v) {
  return qry(r, v) - qry(l - 1, v); 
}
 
struct St {
  int a, b, c, id;
  bool operator < (const St& other) {
    return c > other.c; 
  }; 
}; 
 
int a[N]; 
St s[N], qs[N]; 
int ans[N]; 
 
signed main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n, q;
  cin >> n >> q;
  for (int i = 0; i < n; ++i) {
    cin >> s[i].a >> s[i].b;
    s[i].c = s[i].a + s[i].b; 
    a[i] = s[i].a;
  }
  sort(a, a + n); 
  sort(s, s + n); 
  for (int i = 0; i < n; ++i) {
    s[i].a = lower_bound(a, a + n, s[i].a) - a; 
  }
  for (int i = 0; i < q; ++i) {
    cin >> qs[i].a >> qs[i].b >> qs[i].c;
    qs[i].id = i;
    qs[i].a = lower_bound(a, a + n, qs[i].a) - a; 
  }
  sort(qs, qs + q); 
  for (int i = 0, p = 0; i < q; ++i) {
    while (p < n && s[p].c >= qs[i].c) {
      upd(s[p].a, s[p].b); 
      p++; 
    }
    ans[qs[i].id] = qry(qs[i].a, n - 1, qs[i].b);
  }
  for (int i = 0; i < q; ++i) {
    cout << ans[i] << '\n'; 
  }
  return 0;
}

• Subtask 1: 2 / 2
• Subtask 2: 20 / 20
• Subtask 3: 21 / 21
• Subtask 4: 57 / 57