Submission #997208

#	Time	Username	Problem	Language	Result	Execution time	Memory
997208		VMaksimoski008	Aliens (IOI16_aliens)	C++17	60 / 100	1712 ms	1048576 KiB

aliens

#include "aliens.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

int N, K;
vector<vector<ll> > dp;
vector<pll> vec;

void f(int l, int r, int tl, int tr, int j) {
    if(l > r) return ;
 
    int tm = (l + r) / 2;
    int p = tl;

    for(int i=tl; i<=min(tm, tr); i++) {
        ll v = dp[i-1][j-1] + (ll)(vec[tm].second - vec[i].first + 1) * (ll)(vec[tm].second - vec[i].first + 1);
        v -= (ll)(max(0ll, vec[i-1].second - vec[i].first + 1)) * (ll)(max(0ll, vec[i-1].second - vec[i].first + 1));
        if(v < dp[tm][j]) {
            dp[tm][j] = v;
            p = i;
        }
    }
 
    f(l, tm-1, tl, p, j);
    f(tm+1, r, p, tr, j);
}

ll take_photos(int n, int m, int k, vector<int> r, vector<int> c) {
    //d&c gl hf
    vector<pll> P; P.push_back({ -1, -1 });
    for(int i=0; i<n; i++) {
        if(r[i] > c[i]) P.push_back({ c[i], r[i] });
        else P.push_back({ r[i], c[i] });
    }

    sort(P.begin(), P.end(), [&](pll &a, pll &b) {
        if(a.first == b.first) return a.second > b.second;
        return a.first < b.first;
    });

    vector<pll> P2; P2.push_back(P[0]); P2.push_back(P[1]);

    for(int i=2; i<=n; i++) {
        if(P[i].first <= P2.back().second && P[i].second <= P2.back().second) continue;
        P2.push_back(P[i]);
    }

    P = P2;
    n = P.size() - 1;
    N = n; K = k;
    vec = P;

    dp.resize(n+1, vector<ll>(k+1, 1e18));
    dp[0][0] = 0;

    for(int j=1; j<=k; j++)
        f(1, n, 1, n, j);

    return *min_element(dp[n].begin(), dp[n].end());
}

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 9 / 9
• Subtask 4: 16 / 16
• Subtask 5: 19 / 19
• Subtask 6: 0 / 40