Submission #432019

#	Time	Username	Problem	Language	Result	Execution time	Memory
432019		Tangent	Aliens (IOI16_aliens)	C++17	4 / 100	1 ms	204 KiB

aliens

#include "aliens.h"
#include "bits/stdc++.h"

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vii;
typedef vector<ll> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<vii> vvii;
typedef vector<vll> vvll;
typedef vector<vpii> vvpii;
typedef vector<vpll> vvpll;

#define ffor(i, a, b) for (ll i = (a); i < (ll)(b); i++)
#define fford(i, a, b) for (ll i = (a); i > (ll)(b); i--)
#define rep(i, n) ffor(i, 0, n)
#define forin(x, a) for (auto &x: a)
#define all(a) a.begin(), a.end()
#define sq(x) (x) * (x)

long long take_photos(int n, int m, int k, std::vector<int> r, std::vector<int> cc) {
    vpii intervals;
    rep(i, n) {
        if (r[i] > cc[i]) {
            swap(r[i], cc[i]);
        }
        intervals.emplace_back(r[i], -cc[i]);
    }
    sort(all(intervals));
    vpii merged = {{intervals[0].first, -intervals[0].second}};
    ffor(i, 1, intervals.size()) {
        if (-intervals[i].second > merged.back().second) {
            merged.emplace_back(intervals[i].first, -intervals[i].second);
        }
    }
    while ((int)merged.size() > k) {
        int besti = 0;
        ll mincost = 1ll << 62;
        rep(i, merged.size() - 1) {
            int a, b, c, d;
            tie(a, b) = merged[i];
            tie(c, d) = merged[i + 1];
            ll cost = sq(d - a + 1) - sq(b - a + 1) - sq(d - c + 1) + sq(max(0, b - c + 1));
            if (cost < mincost) {
                mincost = cost;
                besti = i;
            }
        }
        merged[besti].second = merged[besti + 1].second;
        merged.erase(merged.begin() + besti + 1);
    }

    ll res = sq(merged[0].second - merged[0].first + 1);
    rep(i, merged.size() - 1) {
        int a, b, c, d;
        tie(a, b) = merged[i];
        tie(c, d) = merged[i + 1];
        res += sq(d - c + 1) - sq(max(0, b - c + 1));
    }
    
    return res;
}

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