Submission #1291932

#	Time	Username	Problem	Language	Result	Execution time	Memory
1291932		nerrrmin	Examination (JOI19_examination)	C++20	20 / 100	136 ms	5708 KiB

examination

#include<bits/stdc++.h>
#define pb push_back
using namespace std;
const int maxn = 2e5 + 10;
void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}
int n, q, a[maxn], b[maxn];
int t[maxn * 4];
int upos;
void update(int i, int l, int r)
{
    if(l == r)
    {
        t[i] ++;
        return;
    }
    int mid = (l + r)/2;
    if(upos <= mid)update(2*i, l, mid);
    else update(2*i+1, mid+1, r);
    t[i] = (t[2*i] + t[2*i+1]);
}
int ql, qr;
int query(int i, int l, int r)
{
    if(qr < l || ql > r)return 0;
    if(ql <= l && r <= qr)return t[i];
    int mid = (l + r)/2;
    return (query(2*i, l, mid) + query(2*i+1, mid+1, r));
}
struct que
{
    int qa, qb, qc, i;
    que(){};
    que(int _qa, int _qb, int _qc, int _i)
    {
        qa = _qa;
        qb = _qb;
        qc = _qc;
        i = _i;
    }
};
int ans[maxn];
bool cmp(que q1, que q2)
{
    if(q1.qa != q2.qa)return (q1.qa < q2.qa);
    else return (q1.qb < q2.qb);
}
int main()
{
    speed();


    cin >> n >> q;
    int maxn = 2e5;
    vector < pair < int, int > > g;
    for (int i = 1; i <= n; ++ i)
    {
        cin >> a[i] >> b[i];
        g.pb(make_pair(a[i], b[i]));
    }
    sort(g.begin(), g.end());
    reverse(g.begin(), g.end());
    vector < que > qq;
    int qa, qb, qc;
    for (int i = 1; i <= q; ++ i)
    {
        cin >> qa >> qb >> qc;
        qq.pb(que(qa, qb, qc, i));
    }
    sort(qq.begin(), qq.end(), cmp);
    reverse(qq.begin(), qq.end());
    int j = -1;
    for (auto &[qa, qb, qc, qpos]: qq)
    {

        while(j+1 < g.size() && g[j+1].first >= qa)
        {
            upos = g[j+1].second;
            update(1, 0, maxn);
            j ++;
        }
        ql = qb;
        qr = maxn;
        ans[qpos] = query(1, 0, maxn);
    }
    for (int i = 1; i <= q; ++ i)
     cout << ans[i] << endl;
    return 0;
}
/**
5 6
1 2
3 4
5 3
2 10
1 11
1 1 0
2 2 0
4 4 0
4 3 0
0 0 0
0 0 0
*/

• Subtask 1: 0 / 2
• Subtask 2: 20 / 20
• Subtask 3: 0 / 21
• Subtask 4: 0 / 57