Submission #924506

#	Time	Username	Problem	Language	Result	Execution time	Memory
924506		adhityamv	Advertisement 2 (JOI23_ho_t2)	C++17	100 / 100	162 ms	25500 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mp make_pair
#define pii pair<int,int>
#define fi first
#define se second
int INF=1000000000;
const int N=500000;
pii seg[2*N];
int eminusx[N];
int nx[N];
int n;
void build(){
    for(int i=0;i<n;i++){
        seg[i+n]=mp(eminusx[i],i);
    }
    for(int i=n-1;i>0;i--){
        seg[i]=max(seg[2*i],seg[2*i+1]);
    }
}
int query(int l,int r){
    l+=n;
    r+=n;
    pii ans=mp(-INF,-INF);
    while(l<r){
        if(l&1){
            ans=max(ans,seg[l]);
            l++;
        }
        if(r&1){
            r--;
            ans=max(ans,seg[r]);
        }
        l>>=1;
        r>>=1;
    }
    return ans.second;
}
void solve(){
    cin >>n;
    int x[n];
    int e[n];
    for(int i=0;i<n;i++){
        cin >> x[i] >> e[i];
    }
    vector<pii> tosort;
    for(int i=0;i<n;i++) tosort.push_back(mp(e[i]+x[i],e[i]-x[i]));
    sort(tosort.begin(),tosort.end());
    for(int i=0;i<n;i++) eminusx[i]=tosort[i].second;
    build();
    int cnt=0;
    int ind=-1;
    while(ind!=n-1){
        ind=query(ind+1,n);
        cnt++;
    }
    cout << cnt << "\n";
}
signed main(){
    auto begin = std::chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t;
    t=1;
    //cin >> t;
    while(t--) solve();
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
}

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