Submission #768483

#	Time	Username	Problem	Language	Result	Execution time	Memory
768483		green_gold_dog	Advertisement 2 (JOI23_ho_t2)	C++17	100 / 100	1501 ms	78860 KiB

Main

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

template<typename T>
bool assign_min(T& a, T b) {
        if (a > b) {
                a = b;
                return true;
        }
        return false;
}

template<typename T>
bool assign_max(T& a, T b) {
        if (a < b) {
                a = b;
                return true;
        }
        return false;
}

struct cmp {
        constexpr bool operator() (const pair<ll, ll>& p1, const pair<ll, ll>& p2) const {
                return (p1.second == p2.second ? p1.first < p2.first : p1.second > p2.second);
        }
};

struct sum_cmp {
        constexpr bool operator() (const pair<ll, ll>& p1, const pair<ll, ll>& p2) const {
                return (p1.first + p1.second == p2.first + p2.second ? p1.first < p2.first : p1.first + p1.second < p2.first + p2.second);
        }
};

struct sub_cmp {
        constexpr bool operator() (const pair<ll, ll>& p1, const pair<ll, ll>& p2) const {
                return (p1.first - p1.second == p2.first - p2.second ? p1.first < p2.first : p1.first - p1.second > p2.first - p2.second);
        }
};

void solve() {
        ll n;
        cin >> n;
        set<pair<ll, ll>, cmp> s1;
        set<pair<ll, ll>> all;
        for (ll i = 0; i < n; i++) {
                ll x, y;
                cin >> x >> y;
                s1.emplace(x, y);
                all.emplace(x, y);
        }
        ll ans = 0;
        while (!s1.empty()) {
                ans++;
                auto[x, y] = *s1.begin();
                auto it = all.find(*s1.begin());
                auto nit = it;
                vector<pair<ll, ll>> del(1, *s1.begin());
                while (nit != all.begin()) {
                        nit--;
                        auto[nx, ny] = *nit;
                        if (abs(nx - x) <= y - ny) {
                                del.push_back(*nit);
                        } else {
                                break;
                        }
                }
                nit = it;
                nit++;
                while (nit != all.end()) {
                        auto[nx, ny] = *nit;
                        if (abs(nx - x) <= y - ny) {
                                del.push_back(*nit);
                        } else {
                                break;
                        }
                        nit++;
                }
                for (auto i : del) {
                        all.erase(i);
                        s1.erase(i);
                }
        }
        cout << ans << '\n';
}

int main() {
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        cout.tie(0);
        solve();
}

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