Submission #1109509

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109509		tinnhiemnn	trapezoid (balkan11_trapezoid)	C++14	0 / 100	70 ms	11712 KiB

trapezoid

#include <bits/stdc++.h>
using namespace std;
#define file "test"
#define ll long long
#define pii pair<int, int>
#define pll pair<long long, long long>
#define pb push_back
#define mp make_pair
#define all(v) (v).begin(), (v).end()
const int N=1e5+2, INF=1e6;
int n,a[N],b[N],c[N],d[N],bit[INF+2],res,f[N];
vector<int> v;

struct hihi
{
    int x,y,id;
    bool operator < (const hihi &o) const
    {
        if (x!=o.x) return x < o.x; else return id > o.id;
    }
};
vector<hihi> event;

void update(int x, int val)
{
    for (; x<=INF; x+=x&-x) bit[x]=max(bit[x], val);
}
int get(int x)
{
    int res=0; for (; x>0; x-=x&-x) res=max(res, bit[x]);
    return res;
}
int main()
{
    //freopen(file".inp", "r", stdin);
    //freopen(file".out", "w", stdout);
    ios_base::sync_with_stdio(0); cin.tie(0);

    cin>>n;
    for (int i=1;i<=n;i++)
    {
        cin>>a[i]>>b[i]>>c[i]>>d[i];
        v.pb(a[i]); v.pb(b[i]); v.pb(c[i]); v.pb(d[i]);
    }

    for (int i=1;i<=n;i++)
    {
        a[i] = lower_bound(all(v), a[i]) - v.begin()+1;
        b[i] = lower_bound(all(v), b[i]) - v.begin()+1;
        c[i] = lower_bound(all(v), c[i]) - v.begin()+1;
        d[i] = lower_bound(all(v), d[i]) - v.begin()+1;

        event.pb({a[i], c[i], i});
        event.pb({b[i], d[i], -i});
    }

    sort(all(event));

    for (hihi e : event)
    {
        int x=e.x, y=e.y;
        if (e.id > 0)
        {
            f[e.id] = get(y-1) + 1;
            res=max(res, f[e.id]);
        }
        else update(y, f[-e.id]);
    }
    cout<<res;

}

Compilation message (stderr)

trapezoid.cpp: In function 'int main()':
trapezoid.cpp:61:13: warning: unused variable 'x' [-Wunused-variable]
   61 |         int x=e.x, y=e.y;
      |             ^

• Subtask 1: 0 / 100