Submission #150878

#	Time	Username	Problem	Language	Result	Execution time	Memory
150878		gs14004	Crosses on the Grid (FXCUP4_cross)	C++17	100 / 100	118 ms	10724 KiB

cross

#include "cross.h"
#include <bits/stdc++.h>
#define sz(v) ((int)(v).size())
using namespace std;
using pi = pair<int, int>;
using lint = long long;
const int MAXN = 200005;
 
int N;
lint X[MAXN], Y[MAXN];
 
lint func(lint X, lint Y){
	return 2 * X * Y - X * X;
}
 
long long SelectCross(int K, std::vector<int> I, std::vector<int> O) {
	N = I.size();
	vector<pi> v, A;
	for(int i=0; i<N; i++) v.emplace_back(I[i], O[i]);
	sort(v.begin(), v.end());
	reverse(v.begin(), v.end());
	priority_queue<int, vector<int>, greater<int> > pq;
	lint ret = 0;
	for(int i=0; i<sz(v); ){
		int e = i;
		while(e < sz(v) && v[i].first == v[e].first) e++;
		for(int j=i; j<e; j++) pq.push(v[j].second);
		while(sz(pq) > K) pq.pop();
		if(sz(pq) == K) ret = max(ret, func(v[i].first, pq.top()));
		i = e;
	}
	return ret;
}

• Subtask 1: 8 / 8
• Subtask 2: 55 / 55
• Subtask 3: 37 / 37