Submission #657840

#	Time	Username	Problem	Language	Result	Execution time	Memory
657840		benjaminkleyn	Aliens (IOI16_aliens)	C++17	Compilation error	0 ms	0 KiB

aliens

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

#define COL first
#define ROW second

vector<pair<ll,ll>> pts, dp;
pair<ll,ll> eval(int i, int j, ll cost)
{
    ll new_square = (pts[i].COL - pts[j+1].ROW + 1);
    ll overlap = max(pts[j].COL - pts[j+1].ROW + 1, 0LL);
    ll total_area = new_square * new_square - overlap * overlap;

    return {dp[j].first + total_area + cost, dp[j].second + 1};
}

pair<ll,ll> calc(int n, ll cost)
{
    dp[0] = {0, 0};
    for (int i = 1; i <= n; i++)
    {
        dp[i] = {LLONG_MAX, LLONG_MAX};
        for (int j = 0; j < i; j++)
            dp[i] = min(dp[i], eval(i, j, cost));
    }

    return dp[n];
}

ll take_photos(int n, int m, int k, vector<int> r, vector<int> c)
{
    vector<pair<ll,ll>> temp_pts(n);
    for (int i = 0; i < n; i++)
    {
        if (r[i] > c[i])
            swap(r[i], c[i]);
        temp_pts[i] = {c[i], r[i]};
    }
    sort(temp_pts.begin(), temp_pts.end());

    pts.push_back({-1, -1});
    for (pair<ll,ll> pt : temp_pts)
    {
        while (pts.size() && pts.back().ROW >= pt.ROW)
            pts.pop_back();
        pts.push_back(pt);
    }

    n = pts.size() - 1;
    dp.resize(n + 1);

    ll lo = 0, hi = 1e12, res = 1e12, mid;
    while (lo <= hi)
    {
        mid = (lo + hi) / 2;

        calc(n, mid);

        if (dp[n].second <= k)
            hi = mid - 1, res = mid;
        else
            lo = mid + 1;

    }

    calc(n, res);
    return dp[n].first - k * res;
}

int main()
{
    int n, m, k;
    cin >> n >> m >> k;
    vector<int> r(n), c(n);
    for (int i = 0; i < n; i++)
        cin >> r[i] >> c[i];
    cout << take_photos(n, m, k, r, c) << '\n';

    return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccr6vdR6.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccv6MaE6.o:aliens.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status