Submission #998018

#	Time	Username	Problem	Language	Result	Execution time	Memory
998018		green_gold_dog	Izvanzemaljci (COI21_izvanzemaljci)	C++17	26 / 100	2616 ms	14232 KiB

izvanzemaljci

//#pragma GCC optimize("Ofast")
//#pragma GCC target("avx,avx2,sse,sse2,sse3,ssse3,sse4,abm,popcnt,mmx")
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef double db;
typedef long double ldb;
typedef complex<double> cd;

constexpr ll INF64 = 9'000'000'000'000'000'000, INF32 = 2'000'000'000, MOD = 1'000'000'007;
constexpr db PI = acos(-1);
constexpr bool IS_FILE = false, IS_TEST_CASES = false;

random_device rd;
mt19937 rnd32(rd());
mt19937_64 rnd64(rd());

template<typename T>
bool assign_max(T& a, T b) {
        if (b > a) {
                a = b;
                return true;
        }
        return false;
}

template<typename T>
bool assign_min(T& a, T b) {
        if (b < a) {
                a = b;
                return true;
        }
        return false;
}

template<typename T>
T square(T a) {
        return a * a;
}

template<>
struct std::hash<pair<ll, ll>> {
        ll operator() (pair<ll, ll> p) const {
                return ((__int128)p.first * MOD + p.second) % INF64;
        }
};

ll gmaxpref(map<ll, vector<ll>>& all, ll s) {
        ll nx = all.begin()->first;
        ll miny = INF32, maxy = -INF32;
        auto now = all.begin();
        while (now != all.end()) {
                auto[x, ys] = *now;
                if (x - nx > s) {
                        return x;
                }
                for (auto y : ys) {
                        assign_min(miny, y);
                        assign_max(maxy, y);
                }
                if (maxy - miny > s) {
                        return x;
                }
                now++;
        }
        return INF32;
}

ll gmaxsuff(map<ll, vector<ll>>& all, ll s) {
        ll nx = all.rbegin()->first;
        ll miny = INF32, maxy = -INF32;
        auto now = all.rbegin();
        while (now != all.rend()) {
                auto[x, ys] = *now;
                if (nx - x > s) {
                        return x;
                }
                for (auto y : ys) {
                        assign_min(miny, y);
                        assign_max(maxy, y);
                }
                if (maxy - miny > s) {
                        return x;
                }
                now++;
        }
        return -INF32;
}

pair<bool, vector<tuple<ll, ll, ll>>> s2h(ll s, vector<pair<ll, ll>>& arr) {
        map<ll, vector<ll>> all;
        for (auto[x, y] : arr) {
                all[x].push_back(y);
        }
        ll mpref = gmaxpref(all, s), msuff = gmaxsuff(all, s);
        vector<tuple<ll, ll, ll>> ans;
        if (mpref <= msuff) {
                return make_pair(false, ans);
        }
        ll maxx1 = -INF32, minx1 = INF32;
        ll maxy1 = -INF32, miny1 = INF32;
        ll maxx2 = -INF32, minx2 = INF32;
        ll maxy2 = -INF32, miny2 = INF32;
        for (auto[x, y] : arr) {
                if (x < mpref) {
                        assign_max(maxx1, x);
                        assign_min(minx1, x);
                        assign_max(maxy1, y);
                        assign_min(miny1, y);
                } else {
                        assign_max(maxx2, x);
                        assign_min(minx2, x);
                        assign_max(maxy2, y);
                        assign_min(miny2, y);
                }
        }
        ans.emplace_back(maxx1 - s, maxy1 - s, s);
        ans.emplace_back(minx2, miny2, s);
        return make_pair(true, ans);
}

pair<bool, vector<tuple<ll, ll, ll>>> s2v(ll s, vector<pair<ll, ll>>& arr) {
        map<ll, vector<ll>> all;
        for (auto[x, y] : arr) {
                all[y].push_back(x);
        }
        ll mpref = gmaxpref(all, s), msuff = gmaxsuff(all, s);
        vector<tuple<ll, ll, ll>> ans;
        if (mpref <= msuff) {
                return make_pair(false, ans);
        }
        ll maxx1 = -INF32, minx1 = INF32;
        ll maxy1 = -INF32, miny1 = INF32;
        ll maxx2 = -INF32, minx2 = INF32;
        ll maxy2 = -INF32, miny2 = INF32;
        for (auto[x, y] : arr) {
                if (y < mpref) {
                        assign_max(maxx1, x);
                        assign_min(minx1, x);
                        assign_max(maxy1, y);
                        assign_min(miny1, y);
                } else {
                        assign_max(maxx2, x);
                        assign_min(minx2, x);
                        assign_max(maxy2, y);
                        assign_min(miny2, y);
                }
        }
        ans.emplace_back(maxx1 - s, maxy1 - s, s);
        ans.emplace_back(minx2, miny2, s);
        return make_pair(true, ans);
}

void solve() {
        ll n, k;
        cin >> n >> k;
        vector<pair<ll, ll>> arr(n);
        for (ll i = 0; i < n; i++) {
                cin >> arr[i].first >> arr[i].second;
        }
        if (k == 1) {
                ll maxx = -INF32, minx = INF32;
                ll maxy = -INF32, miny = INF32;
                for (auto[x, y] : arr) {
                        assign_max(maxx, x);
                        assign_min(minx, x);
                        assign_max(maxy, y);
                        assign_min(miny, y);
                }
                cout << minx << ' ' << miny << ' ' << max(1ll, max(maxx - minx, maxy - miny)) << '\n';
                return;
        }
        if (k == 2) {
                ll l = 0, r = INF32;
                while (r - l > 1) {
                        ll mid = (l + r) / 2;
                        if (s2h(mid, arr).first || s2v(mid, arr).first) {
                                r = mid;
                        } else {
                                l = mid;
                        }
                }
                if (s2h(r, arr).first) {
                        for (auto[a, b, c] : s2h(r, arr).second) {
                                cout << a << ' ' << b << ' ' << c << '\n';
                        }
                } else {
                        for (auto[a, b, c] : s2v(r, arr).second) {
                                cout << a << ' ' << b << ' ' << c << '\n';
                        }
                }
                return;
        }
}

int main() {
        if (IS_FILE) {
                freopen("", "r", stdin);
                freopen("", "w", stdout);
        }
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        cout.tie(0);
        ll t = 1;
        if (IS_TEST_CASES) {
                cin >> t;
        }
        for (ll i = 0; i < t; i++) {
                solve();
        }
}

Compilation message (stderr)

izvanzemaljci.cpp: In function 'int main()':
izvanzemaljci.cpp:200:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  200 |                 freopen("", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~
izvanzemaljci.cpp:201:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  201 |                 freopen("", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 21 / 21
• Subtask 3: 0 / 12
• Subtask 4: 0 / 30
• Subtask 5: 0 / 32