Submission #676298

#	Time	Username	Problem	Language	Result	Execution time	Memory
676298		vjudge1	Schools (IZhO13_school)	C++17	100 / 100	125 ms	8992 KiB

school

#include <bits/stdc++.h>
using namespace std;


#define f first
#define s second
#define NMAX 300000
typedef long long ll;
int n, M, S;
pair<ll, ll> arr[NMAX + 10];
ll pre[NMAX + 10], sur[NMAX + 10];
priority_queue <ll, vector<ll>, greater<ll> > pq;
bool comp(pair<ll, ll> &u, pair<ll, ll> &v) {
    return (u.f - u.s < v.f - v.s);
}
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen("hth.inp", "r")) {
        freopen("hth.inp", "r", stdin);
        freopen("hth.out", "w", stdout);
    }
    cin >> n >> M >> S;
    for(int i = 1; i <= n; i++) {
        cin >> arr[i].f >> arr[i].s;
    }
    sort(arr + 1, arr + 1 + n, comp);
    long long sum = 0;
    for(int i = 1; i <= S; i++) {
        sum += arr[i].s;
        pq.push(arr[i].s);
    }
    pre[S] = sum;
    for(int i = S + 1; i <= n; i++) {
        pq.push(arr[i].s);
        sum += arr[i].s;
        sum -= pq.top();
        pq.pop();
        pre[i] = sum;
    }
    while(pq.size())
        pq.pop();
    sum = 0;
    for(int i = n; i >= n - M + 1; i --) {
        sum += arr[i].f;
        pq.push(arr[i].f);
    }
    sur[n - M + 1] = sum;
    for(int i = n - M; i > 0; i--) {
        pq.push(arr[i].f);
        sum += arr[i].f;
        sum -= pq.top();
        pq.pop();
        sur[i] = sum;
    }
    ll MAX = 0;
    for(int i = S; i <= n - M; i++)
        MAX = max(MAX, pre[i] + sur[i + 1]);
    cout << MAX;
}

Compilation message (stderr)

school.cpp: In function 'int main()':
school.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen("hth.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
school.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen("hth.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100