Submission #1226688

#	Time	Username	Problem	Language	Result	Execution time	Memory
1226688		ffeyyaae_	Advertisement 2 (JOI23_ho_t2)	C++20	0 / 100	0 ms	324 KiB

Main

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

const int N = 5e5+5;

int n;
vector<pair<ll,ll>> keep;
ll a[N], b[N];

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n;
    for( int i=0;i<n;i++ )
    {
        ll x, e;
        cin >> x >> e;
        keep.push_back( {-x, e} );
    }
    sort( keep.begin(), keep.end() );
    ll mx = -1e18;
    for( int i=0;i<n;i++ )
    {
        auto [x, e] = keep[i];
        a[i] = mx;
        mx = max( mx, e+x );
    }
    mx = -1e18;
    for( int i=n-1;i>=0;i-- )
    {
        auto [x, e] = keep[i];
        b[i] = mx;
        mx = max( mx, e-x );
    }
    int ans = 0;
    for( int i=0;i<n;i++ )
    {
        auto [x, e] = keep[i];
        if( a[i]>=e+x || b[i]>=e-x ) continue;
        ans++;
    }
    cout << ans << "\n";
}

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