#407399 (C++14) No.947 ABC包囲網

• 問題: No.947 ABC包囲網
• ユーザー: jell
• 提出日時: 2019-12-11 00:01:03
• 言語: C++14 (gcc 13.2.0 + boost 1.83.0)
• 結果: CE (最新)
  AC
  (最初)
• 実行時間: -
• コード長: 13,462 bytes
• コンパイル時間: 1,324 ms
• コンパイル使用メモリ: 120,292 KB
• 最終ジャッジ日時: 2023-09-06 07:56:49
• 合計ジャッジ時間: 1,965 ms
• ジャッジサーバーID （参考情報）: judge12 / judge14

コンパイルメッセージ

main.cpp:153:56: エラー: narrowing conversion of ‘-1’ from ‘int’ to ‘long unsigned int’ [-Wnarrowing]
  153 |     template <class tuple_t> struct tupleis<tuple_t, ~0> { static istream &apply(istream &is, tuple_t &t) { return is; } };
      |                                                        ^
main.cpp:364:1: 警告: ISO C++ では型の無い ‘main’ の宣言を禁止しています [-Wreturn-type]
  364 | main()
      | ^~~~

ソースコード

#ifdef LOCAL
    #define _GLIBCXX_DEBUG
    #define __clock__
#else
    #pragma GCC optimize("Ofast")
    // #define NDEBUG
#endif
// #define __buffer_check__
#define __precision__ 10
#define iostream_untie true
#define debug_stream std::cerr

#include <algorithm>
#include <bitset>
#include <cassert>
#include <chrono>
#include <complex>
#include <cstring>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <unordered_map>
#include <unordered_set>

#define all(v) std::begin(v), std::end(v)
#define rall(v) std::rbegin(v), std::rend(v)
#define odd(n) ((n) & 1)
#define even(n) (not __odd(n))
#define __popcount(n) __builtin_popcountll(n)
#define __clz32(n) __builtin_clz(n)
#define __clz64(n) __builtin_clzll(n)
#define __ctz32(n) __builtin_ctz(n)
#define __ctz64(n) __builtin_ctzll(n)

using i32 = int_least32_t; using i64 = int_least64_t; using u32 = uint_least32_t; using u64 = uint_least64_t;
using pii = std::pair<i32, i32>; using pll = std::pair<i64, i64>;
template <class T> using heap = std::priority_queue<T>;
template <class T> using rheap = std::priority_queue<T, std::vector<T>, std::greater<T>>;
template <class T> using hashset = std::unordered_set<T>;
template <class Key, class Value> using hashmap = std::unordered_map<Key, Value>;

namespace setting
{
    using namespace std::chrono;
    system_clock::time_point start_time, end_time;
    long long get_elapsed_time() { end_time = system_clock::now(); return duration_cast<milliseconds>(end_time - start_time).count(); }
    void print_elapsed_time() { debug_stream << "\n----- Exec time : " << get_elapsed_time() << " ms -----\n"; }
    void buffer_check()
    {
        char bufc;
        if(std::cin >> bufc) debug_stream << "\n\033[1;35mwarning\033[0m: buffer not empty.\n";
    }
    struct setupper
    {
        setupper()
        {
            if(iostream_untie) std::ios::sync_with_stdio(false), std::cin.tie(nullptr);
            std::cout << std::fixed << std::setprecision(__precision__);
    #ifdef stderr_path
            if(freopen(stderr_path, "a", stderr))
            {
                std::cerr << std::fixed << std::setprecision(__precision__);
            }
    #endif
    #ifdef stdout_path
            if(not freopen(stdout_path, "w", stdout))
            {
                freopen("CON", "w", stdout);
                debug_stream << "\n\033[1;35mwarning\033[0m: failed to open stdout file.\n";
            }
            std::cout << "";
    #endif
    #ifdef stdin_path
            if(not freopen(stdin_path, "r", stdin))
            {
                freopen("CON", "r", stdin);
                debug_stream << "\n\033[1;35mwarning\033[0m: failed to open stdin file.\n";
            }
    #endif
    #ifdef LOCAL
            debug_stream << "----- stderr at LOCAL -----\n\n";
            atexit(print_elapsed_time);
    #endif
    #ifdef __buffer_check__
            atexit(buffer_check);
    #endif
    #if defined(__clock__) || defined(LOCAL)
            start_time = system_clock::now();
    #endif
        }
    } __setupper; // struct setupper
} // namespace setting
#ifdef __clock__
class
{
    std::chrono::system_clock::time_point built_pt, last_pt; int built_ln, last_ln;
    std::string built_func, last_func; bool is_built = false;
  public:
    void build(int crt_ln, const std::string &crt_func)
    {
        is_built = true, last_pt = built_pt = std::chrono::system_clock::now(),  last_ln = built_ln = crt_ln, last_func = built_func = crt_func;
    }
    void set(int crt_ln, const std::string &crt_func)
    {
        if(is_built) last_pt = std::chrono::system_clock::now(), last_ln = crt_ln, last_func = crt_func;
        else debug_stream << "[ " << crt_ln << " : " << crt_func << " ] " << "myclock_t::set failed (yet to be built!)\n";
    }
    void get(int crt_ln, const std::string &crt_func)
    {
        if(is_built)
        {
            std::chrono::system_clock::time_point crt_pt(std::chrono::system_clock::now());
            long long diff = std::chrono::duration_cast<std::chrono::milliseconds>(crt_pt - last_pt).count();
            debug_stream << diff << " ms elapsed from" << " [ " << last_ln << " : " << last_func << " ]";
            if(last_ln == built_ln) debug_stream << " (when built)";
            debug_stream << " to" << " [ " << crt_ln << " : " << crt_func << " ]" << "\n";
            last_pt = built_pt, last_ln = built_ln, last_func = built_func;
        }
        else
        {
            debug_stream << "[ " << crt_ln << " : " << crt_func << " ] " << "myclock_t::get failed (yet to be built!)\n";
        }
    }
} myclock; // unnamed class
    #define build_clock() myclock.build(__LINE__, __func__)
    #define set_clock() myclock.set(__LINE__, __func__)
    #define get_clock() myclock.get(__LINE__, __func__)
#else
    #define build_clock() ((void)0)
    #define set_clock() ((void)0)
    #define get_clock() ((void)0)
#endif

namespace std
{
    // hash
    template <class T> size_t hash_combine(size_t seed, T const &key) { return seed ^ (hash<T>()(key) + 0x9e3779b9 + (seed << 6) + (seed >> 2)); }
    template <class T, class U> struct hash<pair<T, U>> { size_t operator()(pair<T, U> const &pr) const { return hash_combine(hash_combine(0, pr.first), pr.second); } };
    template <class tuple_t, size_t index = tuple_size<tuple_t>::value - 1> struct tuple_hash_calc { static size_t apply(size_t seed, tuple_t const &t) { return hash_combine(tuple_hash_calc<tuple_t, index - 1>::apply(seed, t), get<index>(t)); } };
    template <class tuple_t> struct tuple_hash_calc<tuple_t, 0> { static size_t apply(size_t seed, tuple_t const &t) { return hash_combine(seed, get<0>(t)); } };
    template <class... T> struct hash<tuple<T...>> { size_t operator()(tuple<T...> const &t) const { return tuple_hash_calc<tuple<T...>>::apply(0, t); } };
    // iostream
    template <class T, class U> istream &operator>>(istream &is, pair<T, U> &p) { return is >> p.first >> p.second; }
    template <class T, class U> ostream &operator<<(ostream &os, const pair<T, U> &p) { return os << p.first << ' ' << p.second; }
    template <class tuple_t, size_t index> struct tupleis { static istream &apply(istream &is, tuple_t &t) { tupleis<tuple_t, index - 1>::apply(is, t); return is >> get<index>(t); } };
    template <class tuple_t> struct tupleis<tuple_t, ~0> { static istream &apply(istream &is, tuple_t &t) { return is; } };
    template <class... T> istream &operator>>(istream &is, tuple<T...> &t)  { return tupleis<tuple<T...>, tuple_size<tuple<T...>>::value - 1>::apply(is, t); }
    template <> istream &operator>>(istream &is, tuple<> &t) { return is; }
    template <class tuple_t, size_t index> struct tupleos { static ostream &apply(ostream &os, const tuple_t &t) { tupleos<tuple_t, index - 1>::apply(os, t); return os << ' ' << get<index>(t); } };
    template <class tuple_t> struct tupleos<tuple_t, 0> { static ostream &apply(ostream &os, const tuple_t &t) { return os << get<0>(t); } };
    template <class... T> ostream &operator<<(ostream &os, const tuple<T...> &t)  { return tupleos<tuple<T...>, tuple_size<tuple<T...>>::value - 1>::apply(os, t); }
    template <> ostream &operator<<(ostream &os, const tuple<> &t) { return os; }
    template <class Container, typename Value = typename Container::value_type, enable_if_t<!is_same<decay_t<Container>, string>::value, nullptr_t> = nullptr>
    istream& operator>>(istream& is, Container &cont) { for(auto&& e : cont) is >> e; return is; }
    template <class Container, typename Value = typename Container::value_type, enable_if_t<!is_same<decay_t<Container>, string>::value, nullptr_t> = nullptr>
    ostream& operator<<(ostream& os, const Container &cont) { bool flag = 1; for(auto&& e : cont) flag ? flag = 0 : (os << ' ', 0), os << e; return os; }
} // namespace std

#ifdef LOCAL
    #define dump(...)                                                              \
        debug_stream << "[ " << __LINE__ << " : " << __FUNCTION__ << " ]\n",       \
            dump_func(#__VA_ARGS__, __VA_ARGS__)
    template <class T> void dump_func(const char *ptr, const T &x)
    {
        debug_stream << '\t';
        for(char c = *ptr; c != '\0'; c = *++ptr) if(c != ' ') debug_stream << c;
        debug_stream << " : " << x << '\n';
    }
    template <class T, class... rest_t> void dump_func(const char *ptr, const T &x, rest_t... rest)
    {
        debug_stream << '\t';
        for(char c = *ptr; c != ','; c = *++ptr) if(c != ' ') debug_stream << c;
        debug_stream << " : " << x << ",\n"; dump_func(++ptr, rest...);
    }
#else
    #define dump(...) ((void)0)
#endif
template <class P> void read_range(P __first, P __second) { for(P i = __first; i != __second; ++i) std::cin >> *i; }
template <class P> void write_range(P __first, P __second) { for(P i = __first; i != __second; std::cout << (++i == __second ? '\n' : ' ')) std::cout << *i; }

// substitue y for x if x > y.
template <class T> inline bool sbmin(T &x, const T &y) { return x > y ? x = y, true : false; }
// substitue y for x if x < y.
template <class T> inline bool sbmax(T &x, const T &y) { return x < y ? x = y, true : false; }
// binary search.
i64 bin(const std::function<bool(i64)> &pred, i64 ok, i64 ng)
{
    while(std::abs(ok - ng) > 1) { i64 mid = (ok + ng) / 2; (pred(mid) ? ok : ng) = mid; }
    return ok;
}
double bin(const std::function<bool(double)> &pred, double ok, double ng, const double eps)
{
    while(std::abs(ok - ng) > eps) { double mid = (ok + ng) / 2; (pred(mid) ? ok : ng) = mid; }
    return ok;
}
// be careful that val is type-sensitive.
template <class T, class A, size_t N> void init(A (&array)[N], const T &val) { std::fill((T *)array, (T *)(array + N), val); }
// reset all bits.
template <class A> void reset(A &array) { memset(array, 0, sizeof(array)); }


/* The main code follows. */

using namespace std;


struct solver
{

    static bool comp(pll p1,pll p2)
    {
        if(p1.second>=0)
        {
            if(p2.second>=0)
            {
                if(!p1.second and !p2.second)
                {
                    return p1.first>p2.second;
                }
                return p1.first*p2.second>p1.second*p2.first;
            }
            else
            {
                return true;
            }
        }
        else
        {
            if(p2.second>=0)
            {
                return false;
            }
            else
            {
                return p1.first*p2.second>p1.second*p2.first;
            }
        }
    }

    bool equal(pll p1, pll p2)
    {
        if(p1.second>0)
        {
            if(p2.second>0)
            {
                return p1.first*p2.second==p1.second*p2.first;
            }
            else
            {
                return false;
            }
        }
        else
        {
            if(p2.second>0)
            {
                return false;
            }
            else
            {
                return p1.first*p2.second==p1.second*p2.first;
            }
        }
    }

    i64 cro(pll p1, pll p2)
    {
        return p1.first*p2.second-p1.second*p2.first;
    }

    solver()
    {
        int n; cin>>n;
        const double pi=acos(-1);

        vector<pll> po(n);
        cin>>po;
        sort(all(po),comp);
        vector<int> cnt(n);

        {
            for(int i=0; i<n; )
            {
                cnt[i]++;
                if(i+1==n) break;
                i64 a,b,c,d;
                tie(a,b)=po[i];
                tie(c,d)=po[i+1];
                if(equal(po[i],po[i+1]))
                {
                    po.erase(po.begin()+i);
                    --n;
                }
                else i++;
            }
            cnt.resize(n);
            dump(po,cnt);
        }

        vector<int> acc(n+1);
        for(int i=0; i<n; ++i)
        {
            acc[i+1]=acc[i]+cnt[i];
        }

        int lb[4040],ub[4040];
        i64 ans=0;
        for(int i=0; i<n; ++i)
        {
            lb[i]=i?lb[i-1]:0;
            ub[i]=i?ub[i-1]:0;

            while(lb[i]<n && (i==lb[i] || cro(po[i],po[lb[i]])>0)) lb[i]++;
            while(ub[i]<n && (i==ub[i] || cro(po[i],po[ub[i]])>=0)) ub[i]++;
        }

        // vector<double> ang(n);
        // for(int i=0; i<n; ++i)
        // {
        //     ang[i]=atan2(po[i].second,po[i].first);
        // }
        // dump(ang);

        // int lb[4040],ub[4040];
        // i64 ans=0;
        // for(int i=0; i<n; ++i)
        // {
        //     lb[i]=i?lb[i-1]:0;
        //     ub[i]=i?ub[i-1]:0;

        //     while(lb[i]<n && ang[lb[i]]<ang[i]+pi) lb[i]++;
        //     while(ub[i]<n && ang[ub[i]]<=ang[i]+pi) ub[i]++;
        // }

        for(int i=0; i<n; ++i)
        {
            for(int j=0; j<i; ++j)
            {
                if(cro(po[j],po[i])>0)
                {
                    ans+=1LL*cnt[i]*cnt[j]*(acc[lb[i]]-acc[ub[j]]);
                }
            }
        }

        // for(int i=0,p=0; i<n; ++i)
        // {
        //     while(i>p && 0>=cro(po[p],po[i])) ++p;
        //     dump(i,p);
        //     ans+=acc[lb[i]]*(acc[i]-acc[p])-acc[ub[i]]*(acc[lb[i]]-acc[i+1]);
        // }

        cout << ans << "\n";
    }
};

main()
{
    u32 t = 1;
#ifdef LOCAL
    t=1;
#endif
    // t = -1; // infinite loop
    // cin >> t; // case number given
    while(t--) solver();
}