Submission #503379

#	Time	Username	Problem	Language	Result	Execution time	Memory
503379		lukameladze	Schools (IZhO13_school)	C++14	75 / 100	2071 ms	19752 KiB

school

# include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define int long long
#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> ms;
multiset <int> :: iterator it;
vector <pii> v;
main() {
    std::ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    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 (ms.size() < m) {
            ms.insert(num);
            sum += num;
        }
        else {
            it = ms.begin();
            if (*it < num) {
                sum -= *it;
                ms.erase(it); 
                sum += num; ms.insert(num);
            }
        } pr[i] = sum;
    } sum = 0;
    ms.clear();
    for (int i = (int)v.size() - 1; i >= 0; i--) {
        num = b[v[i].s];
        
        if (ms.size() < k) {
            ms.insert(num); sum += num;
        } else {
            it = ms.begin();
            if (*it < num) {
                sum -= *it;
                ms.erase(it); sum += num; ms.insert(num);
            }
        }
        sf[i] = sum;
    }
    for (int i = m; i <= n - k; i++) {
        ans = max(ans, pr[i] + sf[i + 1]);
    }
    cout<<ans<<endl;
}

Compilation message (stderr)

school.cpp:13:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   13 | main() {
      | ^~~~
school.cpp: In function 'int main()':
school.cpp:21:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for (int i = 0; i < v.size(); i++) {
      |                     ~~^~~~~~~~~~
school.cpp:23:23: warning: comparison of integer expressions of different signedness: 'std::multiset<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   23 |         if (ms.size() < m) {
      |             ~~~~~~~~~~^~~
school.cpp:40:23: warning: comparison of integer expressions of different signedness: 'std::multiset<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   40 |         if (ms.size() < k) {
      |             ~~~~~~~~~~^~~

• Subtask 1: 75 / 100