Submission #944513

#	Time	Username	Problem	Language	Result	Execution time	Memory
944513		vladilius	Advertisement 2 (JOI23_ho_t2)	C++17	59 / 100	19 ms	2652 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;

struct node{
    int x, e;
};

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n; cin>>n;
    vector<node> t(n + 1);
    for (int i = 1; i <= n; i++){
        cin>>t[i].x>>t[i].e;
    }
    auto cmp = [&](node a, node b){
        return (a.e >= b.e);
    };
    sort(t.begin() + 1, t.end(), cmp);
    vector<int> d(n + 1), s(n + 1);
    for (int i = 1; i <= n; i++){
        d[i] = t[i].e - t[i].x;
        s[i] = t[i].e + t[i].x;
    }
    set<pii> s1, s2;
    for (int i = 1; i <= n; i++){
        s1.insert({d[i], i});
        s2.insert({s[i], i});
    }
    int out = 0;
    vector<bool> used(n + 1);
    for (int i = 1; i <= n; i++){
        if (used[i]) continue;
        used[i] = true;
        // xj <= xi and d[j] <= d[i]
        // xj > xi and s[j] <= s[i]
        auto it = s1.begin();
        vector<int> rem;
        while (it != s1.end()){
            auto [a, j] = *it;
            if (a > d[i]) break;
            if (t[j].x > t[i].x){
                it++;
                continue;
            }
            rem.push_back(j);
            it++;
        }
        it = s2.begin();
        while (it != s2.end()){
            auto [a, j] = *it;
            if (a > s[i]) break;
            if (used[j] || t[j].x < t[i].x){
                it++;
                continue;
            }
            rem.push_back(j);
            it++;
        }
        for (int j: rem){
            used[j] = true;
            it = s1.find({d[j], j});
            if (it != s1.end()) s1.erase(it);
            it = s2.find({s[j], j});
            if (it != s2.end()) s2.erase(it);
        }
        out++;
    }
    cout<<out<<"\n";
}

• Subtask 1: 0 / 10
• Subtask 2: 23 / 23
• Subtask 3: 36 / 36
• Subtask 4: 0 / 31