Submission #672188

#	Time	Username	Problem	Language	Result	Execution time	Memory
672188		Alihan_8	Schools (IZhO13_school)	C++17	100 / 100	105 ms	11396 KiB

school

#include <bits/stdc++.h>
// include <ext/pb_ds/assoc_container.hpp>
// include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
// define ordered_set tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update>
#define mpr make_pair
#define ln '\n'
void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define int long long
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n, m, s; cin >> n >> m >> s;
    vector <pair<int,int>> p(n);
    for ( auto &[l, r]: p ) cin >> l >> r;
    sort(all(p), [&](pair <int,int> &l, pair <int,int> &r){
         return (l.first-l.second) > (r.first-r.second);
    });
    priority_queue <int> q;
    vector <int> L(n), R(n);
    int cnt = 0;
    for ( int i = 0; i < n; i++ ){
        auto [l, r] = p[i];
        q.push(-l);
        cnt += l;
        while ( (int)q.size() > m ){
            cnt -= -q.top();
            q.pop();
        }
        L[i] = cnt;
    }
    cnt = 0;
    while ( !q.empty() ) q.pop();
    for ( int i = n-1; i >= 0; i-- ){
        auto [l, r] = p[i];
        q.push(-r);
        cnt += r;
        while ( (int)q.size() > s ){
            cnt -= -q.top();
            q.pop();
        }
        R[i] = cnt;
    }
    int Mx = max(R[0], L.back());
    for ( int i = 0; i+1 < n; i++ ){
        Mx = max(Mx, L[i]+R[i+1]);
    }
    cout << Mx;

    cout << '\n';
}

Compilation message (stderr)

school.cpp: In function 'void IO(std::string)':
school.cpp:11:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
school.cpp:11:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void IO(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100