Submission #503378

#	Time	Username	Problem	Language	Result	Execution time	Memory
503378		lukameladze	Schools (IZhO13_school)	C++14	55 / 100	2070 ms	16184 KiB

school

# include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define pii pair <int, int> 
using namespace std;
const int N = 3e5 + 5;
int n,m,k,a[N],b[N],sum,num,ans,pr[N],sf[N];
multiset <int> s;
vector <pii> v;
main() {
    cin>>n>>m>>k;
    for (int i = 1; i <= n; i++) {
        cin>>a[i]>>b[i];
        v.pb({a[i] - b[i], i});
    }
    sort(v.begin(),v.end()); reverse(v.begin(),v.end());
    for (int i = 0; i < v.size(); i++) {
        num = a[v[i].s];
        if (s.size() < m) {
            s.insert(num);
            sum += num;
        }
        else {
            if (*(s.begin()) < num) {
                sum -= *(s.begin());
                s.erase(s.begin()); sum += num; s.insert(num);
            }
        } pr[i] = sum;
    } sum = 0;
    s.clear();
    for (int i = (int)v.size() - 1; i >= 0; i--) {
        num = b[v[i].s];
        
        if (s.size() < k) {
            s.insert(num); sum += num;
        } else {
            
            if (*(s.begin()) < num) {
                sum -= *(s.begin());
                s.erase(s.begin()); sum += num; s.insert(num);
            }
        }
        sf[i] = sum;
    }
    for (int i = m; i <= n - k; i++) {
        ans = max(ans, pr[i] + sf[i + 1]);
    //    cout<<i<<" "<<pr[i]<<" "<<sf[i + 1]<<endl;
    }
    cout<<ans<<endl;
}

Compilation message (stderr)

school.cpp:11:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   11 | main() {
      | ^~~~
school.cpp: In function 'int main()':
school.cpp:18:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for (int i = 0; i < v.size(); i++) {
      |                     ~~^~~~~~~~~~
school.cpp:20:22: warning: comparison of integer expressions of different signedness: 'std::multiset<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   20 |         if (s.size() < m) {
      |                      ^
school.cpp:35:22: warning: comparison of integer expressions of different signedness: 'std::multiset<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   35 |         if (s.size() < k) {
      |                      ^

• Subtask 1: 55 / 100