제출 #239012

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
239012		VEGAnn	Cover (COCI18_cover)	C++14	120 / 120	7 ms	512 KiB

cover

#include <bits/stdc++.h>
#define i2 array<int,2>
#define PB push_back
#define all(x) x.begin(),x.end()
#define sz(x) ((int)x.size())
using namespace std;
typedef long long ll;
const int N = 5010;
const ll OO = 1e18;
vector<i2> vc;
i2 a[N];
int x[N], y[N], n;
ll f[N];

void upd(ll &x, ll y){
    x = min(x, y);
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);

#ifdef _LOCAL
    freopen("in.txt","r",stdin);
#endif // _LOCAL

    cin >> n;

    for (int i = 0; i < n; i++) {
        cin >> a[i][0] >> a[i][1];
        a[i][0] = abs(a[i][0]);
        a[i][1] = abs(a[i][1]);
    }

    sort(a, a + n);
    reverse(a, a + n);

    vc.PB(a[0]);

    for (int i = 1; i < n; i++)
        if (a[i][1] > vc.back()[1])
            vc.PB(a[i]);

    reverse(all(vc));

    f[0] = 0;
    n = sz(vc);

    fill(f + 1, f + n + 1, OO);

    for (int i = 0; i < n; i++)
    for (int j = i + 1; j <= n; j++)
        upd(f[j], f[i] + ll(vc[i][1]) * ll(vc[j - 1][0]));

    cout << f[n] * 4;

    return 0;
}

• Subtask 1: 120 / 120