Submission #671902

#	Time	Username	Problem	Language	Result	Execution time	Memory
671902		Alihan_8	Schools (IZhO13_school)	C++17	25 / 100	127 ms	9508 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, a, b; cin >> n >> a >> b;
    vector <pair<int,int>> p(n);
    for ( auto &[l, r]: p ) cin >> l >> r;
    vector <int> pos(n);
    iota(all(pos), 0);
    sort(all(pos), [&](int &x, int &y){
         return p[x].first+p[y].second > p[y].first+p[x].second;
    });
    int cnt = 0;
    priority_queue <int> q;
    for ( int i = 0; i < a; i++ ) cnt += p[pos[i]].first;
    for ( int i = a; i < n; i++ ) q.push(p[pos[i]].second);
    int _b = b;
    while ( b-- ){
        cnt += q.top(); q.pop();
    } b = _b;
    int Mx = cnt; cnt = 0;
    iota(all(pos), 0);
    sort(all(pos), [&](int &x, int &y){
         return p[x].second+p[y].first < p[y].second+p[x].first;
    });
    while ( !q.empty() ) q.pop();
    for ( int i = 0; i < b; i++ ) cnt += p[pos[i]].second;
    for ( int i = b; i < n; i++ ) q.push(p[pos[i]].first);
    while ( a-- ){
        cnt += q.top(); q.pop();
    }
    cout << max(cnt, 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: 25 / 100