Submission #503380

#	Time	Username	Problem	Language	Result	Execution time	Memory
503380		lukameladze	Schools (IZhO13_school)	C++14	100 / 100	233 ms	19788 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());
    if (m) {
        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();
    if (k) {
        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;
        }
    }
    if (m == 0) {
        cout<<sf[0]<<endl;
        return 0;
    }
    if (k == 0) {
        cout<<pr[n-1]<<endl; return 0;
    }
    for (int i = m - 1; i <= n - k - 1; 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:22:27: 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]
   22 |         for (int i = 0; i < v.size(); i++) {
      |                         ~~^~~~~~~~~~
school.cpp:24:27: 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]
   24 |             if (ms.size() < m) {
      |                 ~~~~~~~~~~^~~
school.cpp:44:27: 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]
   44 |             if (ms.size() < k) {
      |                 ~~~~~~~~~~^~~

• Subtask 1: 100 / 100