Submission #877491

#	Time	Username	Problem	Language	Result	Execution time	Memory
877491		noiaint	Cover (COCI18_cover)	C++17	120 / 120	4 ms	2616 KiB

cover

#include <bits/stdc++.h>

using namespace std;
#define int long long

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

#define file ""

#define mp make_pair
#define fi first
#define se second
#define all(x) x.begin(), x.end()

#define bit(x) (1LL << (x))
#define getbit(x, i) (((x) >> (i)) & 1)
#define popcount __builtin_popcountll

mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r) {
    return l + rd() % (r - l + 1);
}

const int N = 1e6 + 5;
const int mod = (int)1e9 + 7; // 998244353;
const int lg = 25; // lg + 1
const int oo = 1e9;
const long long ooo = 1e18;

template<class X, class Y> bool mini(X &a, Y b) {
    return a > b ? (a = b, true) : false;
}
template<class X, class Y> bool maxi(X &a, Y b) {
    return a < b ? (a = b, true) : false;
}
void add(int &a, int b) {
    a += b;
    if (a >= mod) a -= mod;
    if (a < 0) a += mod;
}

int n;
pair<int, int> a[N];
int f[N];

void process() {
    cin >> n;
    for (int i = 1; i <= n; ++i) {
        cin >> a[i].fi >> a[i].se;
        a[i].fi = abs(a[i].fi);
        a[i].se = abs(a[i].se);
    }
    sort(a + 1, a + n + 1);
    vector<int> st;
    for (int i = 1; i <= n; ++i) {
        while (st.size() && a[st.back()].se <= a[i].se) st.pop_back();
        st.push_back(i);
    }
    n = (int) st.size();
    for (int i = 1; i <= n; ++i) {
        f[i] = 1e18;
        for (int j = 1; j <= i; ++j) mini(f[i], f[j - 1] + a[st[i - 1]].fi * a[st[j - 1]].se);
    }
    cout << f[n] * 4;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    #ifdef LOCAL
    freopen("input.txt", "r", stdin);
    // freopen(file".out", "w", stdout);
    #endif

    int tc = 1;
    // cin >> tc;
    
    while (tc--) {
        process();
    }

    return 0;
}

/*

*/

• Subtask 1: 120 / 120