Submission #126851

#	Time	Username	Problem	Language	Result	Execution time	Memory
126851		Osama_Alkhodairy	Examination (JOI19_examination)	C++17	20 / 100	2248 ms	155000 KiB

examination

#include <bits/stdc++.h>
using namespace std;
#define finish(x) return cout << x << endl, 0
#define ll long long

const int N = 100001;
const int A = 200001;
const int INF = (int)1e9;

#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
typedef tree <pair <int, int>, null_type, less <pair <int, int> >, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

int n, m;
vector <pair <int, int> > a, q[A];
ordered_set v[4 * N];

void insert(ordered_set &s, int v){
    auto it = s.upper_bound(make_pair(v, INF));
    if(it == s.begin()){
        s.insert(make_pair(v, 0));
        return;
    }
    it--;
    if(it == s.end() || (*it).first != v) s.insert(make_pair(v, 0));
    else s.insert(make_pair(v, (*it).second + 1));
}
void erase(ordered_set &s, int v){
    auto it = s.upper_bound(make_pair(v, INF));
    it--;
    s.erase(it);
}
void update(int l, int r, int node, int ind, int val){
    if(r < l || l > ind || r < ind) return;
    insert(v[node], val);
    if(l == r) return;
    int mid = (l + r) / 2;
    if(ind <= mid) update(l, mid, 2 * node, ind, val);
    update(mid + 1, r, 2 * node + 1, ind, val);
}
int query(int l, int r, int node, int s, int e, int val){
    if(r < l || r < s || l > e) return 0;
    if(s <= l && r <= e){
        return (int)v[node].size() - v[node].order_of_key(make_pair(val, -INF));
    }
    int mid = (l + r) / 2;
    return query(l, mid, 2 * node, s, e, val) + query(mid + 1, r, 2 * node + 1, s, e, val);
}
int query(int suffix, int val){
    return query(0, n - 1, 1, suffix, n - 1, val);
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    a.resize(n);
    for(auto &i : a) cin >> i.first >> i.second;
    sort(a.begin(), a.end());
    for(int i = 0 ; i < n ; i++){
        update(0, n - 1, 1, i, a[i].second);
    }
    for(int i = 0 ; i < m ; i++){
        int x, y, z;
        cin >> x >> y >> z;
        int suff = lower_bound(a.begin(), a.end(), make_pair(x, -INF)) - a.begin();
        if(suff == n){
            cout << 0 << endl;
            continue;
        }
        cout << query(suff, y) << endl;
    }
}

• Subtask 1: 0 / 2
• Subtask 2: 20 / 20
• Subtask 3: 0 / 21
• Subtask 4: 0 / 57