Submission #715251

#	Time	Username	Problem	Language	Result	Execution time	Memory
715251		ismayil	Examination (JOI19_examination)	C++17	2 / 100	252 ms	4780 KiB

examination

#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int MAX = 1e5;
int bit[MAX + 1];
void update(int pos, int val){
    for(int i = pos; i <= MAX; i = i | (i + 1)){
        bit[i] += val;
    }
}
int query(int pos){
    int res = 0;
    for(int i = pos; i >= 0; i = (i & (i + 1)) - 1){
        res += bit[i];
    }
    return res;
}
int query(int l, int r){
    if(l == 0) return query(r);
    return query(r) - query(l - 1);
}
struct event{
    int x, y, idx, type;
};
bool f(event a, event b){
    if(a.x == b.x) a.type > b.type;
    return a.x < b.x;
}
int n, m;
void solve2(){
    vector<event> events;
    for(int i = 0; i < n; i++){
        int x, y;
        cin>>x>>y;
        events.push_back({x, y, -1, 0});
    }
    for(int i = 0; i < m; i++){
        int x, y, z;
        cin>>x>>y>>z;
        events.push_back({x, y, i, 1});
    }
    sort(events.begin(), events.end(), f);
    int ans[m];
    for (int i = m - 1; i >= 0; i--)
    {
        if(events[i].type == 0){
            update(events[i].y, 1);
        }else{
            ans[events[i].idx] = query(events[i].y, MAX);
        }
    }
    for (int i = 0; i < m; i++) cout<<ans[i]<<endl;
}
void solve1(){
    vector<pair<int, int>> p;
    for(int i = 0; i < n; i++){
        int x, y;
        cin>>x>>y;
        p.push_back({x, y});
    }
    for(int i = 0; i < m; i++){
        int x, y, z;
        cin>>x>>y>>z;
        int cnt = 0;
        for(int i = 0; i < n; i++){
            if(p[i].first >= x && p[i].second >= y && p[i].first + p[i].second >= z) cnt++;
        }
        cout<<cnt<<endl;
    }
}
int main(){
    
    cin>>n>>m;
    if(n <= 3000 && m <= 3000) solve1();
    else solve2();
}

Compilation message (stderr)

examination.cpp: In function 'bool f(event, event)':
examination.cpp:26:27: warning: statement has no effect [-Wunused-value]
   26 |     if(a.x == b.x) a.type > b.type;
      |                    ~~~~~~~^~~~~~~~

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