Submission #363218

#	Time	Username	Problem	Language	Result	Execution time	Memory
363218		Ruxandra985	Schools (IZhO13_school)	C++14	25 / 100	363 ms	14700 KiB

school

#include <bits/stdc++.h>
#define DIMN 300010
using namespace std;
int x[DIMN] , y[DIMN];
pair <int , int> v[DIMN];
multiset <int> w;
int cmp (pair <int , int> a , pair <int , int> b){
    return a > b;
}
int main()
{
    FILE *fin = stdin;
    FILE *fout = stdout;
    int n , m , s , i , aux ,idx;
    long long suma , sol = 0;
    multiset<int> :: iterator it , it2;
    fscanf (fin,"%d%d%d",&n,&m,&s);
    for (i = 1 ; i <= n ; i++){
        fscanf (fin,"%d%d",&x[i],&y[i]);

        v[i] = make_pair(x[i] - y[i] , i);

    }

    sort (v + 1 , v + n + 1 , cmp);
    /// v = ordinea prioritatilor

    suma = 0;

    for (i = 1 ; i <= m ; i++){
        suma += x[v[i].second];
    }

    for (i = m + 1 ; i <= n ; i++){
        w.insert(y[v[i].second]);
    }
    idx = 0;
    it = w.end();

    while (idx < s){
        it--;
        idx++;
        suma += *it;
        aux = *it;
    }
    /// aux e cea mai mica valoare luata din sufixul ala

    sol = suma;

    for (i = m + 1 ; i <= n ; i++){
        suma -= x[v[i - m].second];
        suma += x[v[i].second];

        /// cele mai mari s uri

        /// adaugi i - m ul

        if (y[v[i - m].second] >= aux){ /// ai o pb, il adaugi
            suma -= aux;
            suma += y[v[i - m].second];

            it++;
            aux = (*it);


        }

        w.insert(y[v[i - m].second]);

        /// scoti i ul din multiset

        if (y[v[i].second] >= aux){ /// ai o pb
            suma -= y[v[i].second];
            it--;

            suma += *it;
            aux = *it;


        }
        w.erase(y[v[i].second]);
        /// it vreau sa fie prima pozitie a lui aux


        sol = max(sol , suma);
    }
    fprintf (fout,"%lld",sol);
    return 0;
}

Compilation message (stderr)

school.cpp: In function 'int main()':
school.cpp:17:12: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |     fscanf (fin,"%d%d%d",&n,&m,&s);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
school.cpp:19:16: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |         fscanf (fin,"%d%d",&x[i],&y[i]);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
school.cpp:59:21: warning: 'aux' may be used uninitialized in this function [-Wmaybe-uninitialized]
   59 |             suma -= aux;
      |                     ^~~

• Subtask 1: 25 / 100