Submission #1286130

#	Time	Username	Problem	Language	Result	Execution time	Memory
1286130		shidou26	별자리 2 (JOI14_constellation2)	C++20	100 / 100	737 ms	800 KiB

constellation2

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

#ifdef KURUMI
    #include "algo/debug.h"
#endif

#define endl '\n'
#define fi first
#define se second
#define sz(v) (int)v.size()
#define all(v) v.begin(), v.end()
#define filter(v) v.resize(unique(all(v)) - v.begin())
#define dbg(x) "[" #x << " = " << x << "]" 

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
template<typename T1, typename T2> T2 rand(T1 l, T2 r) {
    return uniform_int_distribution<T2>(l, r)(rng);
}
template<typename T1, typename T2> T2 wrand(T1 l, T2 r, int seed) {
    if(seed == 0) return rand(l, r);
    else return (seed > 0 ? max(rand(l, r), wrand(l, r, seed - 1)) : min(rand(l, r), wrand(l, r, seed + 1)));
}

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

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, int> pli;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> tp3;

const int N = 3e3 + 3;

struct Point {
    ll x, y, t;
    Point (ll x = 0, ll y = 0, ll t = 0) : x(x), y(y), t(t) {}

    Point operator - (const Point &o) const {return Point(x - o.x, y - o.y, t);}

    friend ll cross(Point a, Point b) {return a.x * b.y - a.y * b.x;}

    friend bool turnLeft(Point a, Point b, Point c) {
        return cross(b - a, c - a) > 0;
    }

    friend ostream& operator << (ostream& stream, Point &p) {
        return stream << "(" << p.x << " " << p.y << ")";
    } 
};

int n;
Point p[N];

void input() {
    cin >> n;

    for(int i = 1; i <= n; i++) {
        cin >> p[i].x >> p[i].y >> p[i].t;
    }
}

namespace subtask_2 {
    bool approve() {
        return n <= 300;
    }

    int cup[3], cdown[3];

    void execute() {
        ll answer = 0;
        for(int i = 1; i <= n; i++) {
            for(int j = 1; j <= n; j++) if(i != j) {
                memset(cup, 0, sizeof(cup));
                memset(cdown, 0, sizeof(cdown));

                // cout << dbg(p[i]) << " " << dbg(p[j]) << endl;
                for(int k = 1; k <= n; k++) {
                    if(k == i || k == j) continue;
                    // cout << p[k] << " " << turnLeft(p[i], p[j], p[k]) << endl;
                    if(turnLeft(p[i], p[j], p[k])) cdown[p[k].t]++;
                    else cup[p[k].t]++;
                }

                ll current = 1;
                for(int one = 0; one < 3; one++) if(one != p[i].t) current *= cup[one];
                for(int two = 0; two < 3; two++) if(two != p[j].t) current *= cdown[two];

                answer += current; 
            }
        }

        cout << answer / 2 << endl;
    }
}

namespace subtask_3 {
    bool approve() {
        return true;
    }

    int type[N], counter[2][3];
    ll answer = 0;

    void move(int fix) {
        vector<Point> moved;
        for(int i = 1; i <= n; i++) if(i != fix) {
            moved.push_back(p[i] - p[fix]);
        }

        sort(all(moved), [&](Point a, Point b) {
            if(cross(a, b) == 0) return a.x < b.x; 

            bool is_right_a = (a.x >= 0);
            bool is_right_b = (b.x >= 0);

            if(is_right_a != is_right_b) return (cross(a, b) < 0);
            return (cross(a, b) > 0);
        });

        memset(counter, 0, sizeof(counter));
        for(int i = 0; i < sz(moved); i++) {
            type[i] = (moved[i].x >= 0);
            counter[type[i]][moved[i].t]++;
        }

        for(int i = 0; i < sz(moved); i++) {
            counter[type[i]][moved[i].t]--;

            ll current = 1;
            for(int one = 0; one < 3; one++) if(one != p[fix].t) current *= counter[0][one];
            for(int two = 0; two < 3; two++) if(two != moved[i].t) current *= counter[1][two];
            answer += current;

            current = 1;
            for(int one = 0; one < 3; one++) if(one != p[fix].t) current *= counter[1][one];
            for(int two = 0; two < 3; two++) if(two != moved[i].t) current *= counter[0][two];
            answer += current;

            type[i] ^= 1;
            counter[type[i]][moved[i].t]++;
        }
    }

    void execute() {
        for(int i = 1; i <= n; i++) {
            move(i);
        }

        cout << answer / 4 << endl;
    }
}

void process() {
    if(subtask_2::approve()) return subtask_2::execute();
    if(subtask_3::approve()) return subtask_3::execute();
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    #define task "Deeto"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    
    int testcase = 1; // cin >> testcase;    
    for(int i = 1; i <= testcase; i++) {
        input();
        process();
    }

    cerr << "Saa, watashtachi no deeto hajimemashou" << endl;
    cerr << "Atarashii kiseki wo koko kara hajimeru shining place nee mou ichido kimi to..." << endl;
    
    return 0;
}

/*
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*/

Compilation message (stderr)

constellation2.cpp: In function 'int main()':
constellation2.cpp:177:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  177 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
constellation2.cpp:178:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  178 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 45 / 45