Submission #835087

#	Time	Username	Problem	Language	Result	Execution time	Memory
835087		jasmin	Advertisement 2 (JOI23_ho_t2)	C++17	10 / 100	163 ms	25692 KiB

Main

//JOI 2023 Final Round
#include<bits/stdc++.h>
using namespace std;
#define int long long

const int INF=1e18;

void solve(){
    int n;
    cin >> n;
    vector<pair<int,int> > a(n);
    for(int i=0; i<n; i++){
        cin >> a[i].second >> a[i].first;
    }
    sort(a.begin(), a.end());
    reverse(a.begin(), a.end());

    set<pair<int,int> > given;
    int ans=0;
    for(int i=0; i<n; i++){
        auto [e, x]=a[i];

        auto r=given.upper_bound({x, e});
        if(r!=given.end()){

            auto [x2, e2]=*r;
            if(e2-e >= x2-x) continue;
        }
        if(r!=given.begin()){

            auto [x2, e2] =*prev(r);
            if(e2-e >= x-x2) continue;
        }

        ans++;
        given.insert({x, e});
    }

    cout << ans << "\n";
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;
    vector<pair<int,int> > a(n);
    vector<pair<int,int> > sorted(n);
    for(int i=0; i<n; i++){
        cin >> a[i].first >> a[i].second;

        sorted[i]={a[i].second-a[i].first, i};
    }
    sort(sorted.begin(), sorted.end());
    reverse(sorted.begin(), sorted.end());

    int maxi=-INF;
    int ans=0;
    for(auto [val, i]: sorted){
        auto [x, e] = a[i];

        if(x+e <= maxi) continue;

        maxi = x+e;
        ans++;
    }
    cout << ans << "\n";
}

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