Submission #1057421

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057421		TAhmed33	Aliens (IOI16_aliens)	C++98	25 / 100	2050 ms	42492 KiB

aliens

#include "aliens.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
//#include "grader.cpp"
const ll inf = 1e16;
inline ll sq (ll x) {
    return x * x;
}
struct CHT {
    vector <pair <ll, ll>> dd;
    void init () {

    }
    ll query (ll x) {
        ll mn = inf;
        for (auto j : dd) {
            mn = min(mn, j.first * x + j.second);
        }
        return mn;
    }
    void insert (ll x, ll y) {
        dd.push_back({x, y});
    }
};
ll take_photos (int n, int m, int k, vector <int> r, vector <int> c) {
    array <ll, 2> a[n + 2];
    for (int i = 0; i < n; i++) {
        if (r[i] < c[i]) {
            swap(r[i], c[i]);
        }
        c[i]++; r[i]++;
        a[i + 1] = {c[i], r[i]};
    }
    sort(a + 1, a + n + 1, [&] (array <ll, 2> &x, array <ll, 2> &y) {
        return x[0] == y[0] ? x[1] > y[1] : x[0] < y[0];
    });
    ll mx = 0;
    array <ll, 2> b[n + 2];
    int d = 0;
    for (int i = 1; i <= n; i++) {
        if (mx >= a[i][1]) {
            continue;
        }
        b[++d] = a[i];
        mx = a[i][1];
    }
    n = d;
    ll dp[n + 2][k + 2] = {};
    for (int i = 1; i <= n; i++) {
        a[i] = b[i];
    }
    a[n + 1] = {m + 1, m + 1};
    for (int i = 1; i <= n; i++) {
        dp[i][0] = inf;
    }
    for (int j = 1; j <= k; j++) {
        CHT cur;
        cur.init();
        for (int i = n; i >= 1; i--) {
            cur.insert(-2 * a[i][1], sq(a[i][1]) + 2 * a[i][1] - sq(max(0ll, a[i][1] - a[i + 1][0] + 1)) + dp[i + 1][j - 1]);
            dp[i][j] = cur.query(a[i][0]) + sq(a[i][0]) - 2 * a[i][0] + 1;
        }
    }
    return dp[1][k];
}

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