Submission #938854

#	Time	Username	Problem	Language	Result	Execution time	Memory
938854		green_gold_dog	Circle selection (APIO18_circle_selection)	C++17	7 / 100	3083 ms	27128 KiB

circle_selection

//#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;
        }
};

struct circle {
        ll x, y, r, id;
        circle(ll x = 0, ll y = 0, ll r = 0, ll id = 0): x(x), y(y), r(r), id(id) {}
        bool operator<(const circle c2) const {
                return c2.r < r;
        }
        bool check(circle c2) {
                return square(x - c2.x) + square(y - c2.y) <= square(r + c2.r);
        }
};

void solve() {
        ll n;
        cin >> n;
        vector<circle> all(n);
        for (ll i = 0; i < n; i++) {
                cin >> all[i].x >> all[i].y >> all[i].r;
                all[i].id = i;
        }
        stable_sort(all.begin(), all.end());
        vector<ll> ans(n, -1);
        for (ll i = 0; i < n; i++) {
                if (ans[all[i].id] == -1) {
                        ans[all[i].id] = all[i].id;
                        for (ll j = i + 1; j < n; j++) {
                                if (all[i].check(all[j]) && ans[all[j].id] == -1) {
                                        ans[all[j].id] = all[i].id;
                                }
                        }
                }
        }
        for (auto i : ans) {
                cout << i + 1 << ' ';
        }
        cout << '\n';
}

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)

circle_selection.cpp: In function 'int main()':
circle_selection.cpp:89:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |                 freopen("", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~
circle_selection.cpp:90:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |                 freopen("", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 0 / 12
• Subtask 3: 0 / 15
• Subtask 4: 0 / 23
• Subtask 5: 0 / 30
• Subtask 6: 0 / 13