#294734 (C++17) No.20 砂漠のオアシス

提出ソース

結果

問題	No.20 砂漠のオアシス
ユーザー	mai
提出日時	2018-10-27 18:58:47
言語	C++17 (gcc 12.3.0 + boost 1.83.0)
結果	AC
実行時間	15 ms / 5,000 ms
コード長	8,644 bytes
コンパイル時間	2,848 ms
コンパイル使用メモリ	225,032 KB
実行使用メモリ	6,820 KB
最終ジャッジ日時	2024-11-19 06:50:05
合計ジャッジ時間	3,557 ms
ジャッジサーバーID （参考情報）	judge5 / judge4

このコードへのチャレンジ
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テストケース

テストケース表示

入力	結果	実行時間実行使用メモリ
testcase_00	AC	2 ms 6,816 KB
testcase_01	AC	2 ms 6,816 KB
testcase_02	AC	2 ms 6,820 KB
testcase_03	AC	2 ms 6,820 KB
testcase_04	AC	3 ms 6,820 KB
testcase_05	AC	15 ms 6,820 KB
testcase_06	AC	14 ms 6,820 KB
testcase_07	AC	14 ms 6,816 KB
testcase_08	AC	8 ms 6,820 KB
testcase_09	AC	14 ms 6,820 KB
testcase_10	AC	1 ms 6,816 KB
testcase_11	AC	2 ms 6,820 KB
testcase_12	AC	2 ms 6,816 KB
testcase_13	AC	3 ms 6,820 KB
testcase_14	AC	3 ms 6,820 KB
testcase_15	AC	3 ms 6,816 KB
testcase_16	AC	4 ms 6,816 KB
testcase_17	AC	3 ms 6,820 KB
testcase_18	AC	4 ms 6,820 KB
testcase_19	AC	5 ms 6,816 KB
testcase_20	AC	2 ms 6,816 KB

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ソースコード

raw source code

#pragma GCC optimize ("O3")
#include "bits/stdc++.h"

using namespace std;
using ll = long long int;

#define debugos clog
#define debug(v) {printf("L%d %s > ",__LINE__,#v);debugos<<(v)<<endl;}
#define debugv(v) {printf("L%d %s > ",__LINE__,#v);for(auto e:(v)){debugos<<e<<" ";}debugos<<endl;}
#define debuga(m,w) {printf("L%d %s > ",__LINE__,#m);for(int x=0;x<(w);x++){debugos<<(m)[x]<<" ";}debugos<<endl;}
#define debugaa(m,h,w) {printf("L%d %s >\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){debugos<<(m)[y][x]<<" ";}debugos<<endl;}}
#define ALL(v) (v).begin(),(v).end()
#define repeat(cnt,l) for(remove_reference<remove_const<decltype(l)>::type>::type cnt=0;(cnt)<(l);++(cnt))
#define rrepeat(cnt,l) for(auto cnt=(l)-1;0<=(cnt);--(cnt))
#define iterate(cnt,b,e) for(auto cnt=(b);(cnt)!=(e);++(cnt))
#define diterate(cnt,b,e) for(auto cnt=(b);(cnt)!=(e);--(cnt))
const ll MD = 1000000007ll; const long double PI = 3.1415926535897932384626433832795L;
inline void assert_call(bool assertion, function<void()> f) { if (!assertion) { cerr << "assertion fault:" << endl; f(); abort(); } }
template<typename T1, typename T2> inline ostream& operator <<(ostream &o, const pair<T1, T2> p) { o << '(' << p.first << ':' << p.second << ')'; return o; }
template<typename Vec> inline ostream& _ostream_vecprint(ostream& os, const Vec& a) {
    os << '['; for (const auto& e : a) os << ' ' << e << ' '; os << ']'; return os;
}
template<typename T> inline ostream& operator<<(ostream& o, const vector<T>& v) { return _ostream_vecprint(o, v); }
template<typename T, size_t S> inline ostream& operator<<(ostream& o, const array<T, S>& v) { return _ostream_vecprint(o, v); }
template<typename T> inline T& maxset(T& to, const T& val) { return to = max(to, val); }
template<typename T> inline T& minset(T& to, const T& val) { return to = min(to, val); }
void bye(string s, int code = 0) { cout << s << endl; exit(code); }
mt19937_64 randdev(8901016);
template<typename T> inline T rand(T l, T h) { return uniform_int_distribution<T>(l, h)(randdev); }
template<> inline double rand<double>(double l, double h) { return uniform_real_distribution<double>(l, h)(randdev); }
template<> inline float rand<float>(float l, float h) { return uniform_real_distribution<float>(l, h)(randdev); }


#if defined(_WIN32) || defined(_WIN64)
#define getchar_unlocked _getchar_nolock
#define putchar_unlocked _putchar_nolock
#elif defined(__GNUC__)
#else
#define getchar_unlocked getchar
#define putchar_unlocked putchar
#endif
namespace {
#define isvisiblechar(c) (0x21<=(c)&&(c)<=0x7E)
    class MaiScanner {
    public:
        template<typename T> void input_integer(T& var) noexcept {
            var = 0; T sign = 1;
            int cc = getchar_unlocked();
            for (; cc < '0' || '9' < cc; cc = getchar_unlocked())
                if (cc == '-') sign = -1;
            for (; '0' <= cc && cc <= '9'; cc = getchar_unlocked())
                var = (var << 3) + (var << 1) + cc - '0';
            var = var * sign;
        }
        inline int c() noexcept { return getchar_unlocked(); }
        inline MaiScanner& operator>>(int& var) noexcept { input_integer<int>(var); return *this; }
        inline MaiScanner& operator>>(long long& var) noexcept { input_integer<long long>(var); return *this; }
        inline MaiScanner& operator>>(string& var) {
            int cc = getchar_unlocked();
            for (; !isvisiblechar(cc); cc = getchar_unlocked());
            for (; isvisiblechar(cc); cc = getchar_unlocked())
                var.push_back(cc);
            return *this;
        }
        template<typename IT> void in(IT begin, IT end) { for (auto it = begin; it != end; ++it) *this >> *it; }
    };
    class MaiPrinter {
    public:
        template<typename T>
        void output_integer(T var) noexcept {
            if (var == 0) { putchar_unlocked('0'); return; }
            if (var < 0)
                putchar_unlocked('-'),
                var = -var;
            char stack[32]; int stack_p = 0;
            while (var)
                stack[stack_p++] = '0' + (var % 10),
                var /= 10;
            while (stack_p)
                putchar_unlocked(stack[--stack_p]);
        }
        inline MaiPrinter& operator<<(char c) noexcept { putchar_unlocked(c); return *this; }
        inline MaiPrinter& operator<<(int var) noexcept { output_integer<int>(var); return *this; }
        inline MaiPrinter& operator<<(long long var) noexcept { output_integer<long long>(var); return *this; }
        inline MaiPrinter& operator<<(char* str_p) noexcept { while (*str_p) putchar_unlocked(*(str_p++)); return *this; }
        inline MaiPrinter& operator<<(const string& str) {
            const char* p = str.c_str();
            const char* l = p + str.size();
            while (p < l) putchar_unlocked(*p++);
            return *this;
        }
        template<typename IT> void join(IT begin, IT end, char sep = ' ') { for (bool b = 0; begin != end; ++begin, b = 1) b ? *this << sep << *begin : *this << *begin; }
    };
}
MaiScanner scanner;
MaiPrinter printer;


struct P {
    using T = int;
    T y, x;

    P(T _y = 0, T _x = 0) :y(_y), x(_x) {}

    inline bool operator == (P p) const { return y == p.y && x == p.x; }
    inline bool operator < (P p) const { return y == p.y ? x < p.x : y < p.y; }
    inline P operator+(P p) const { return P(y + p.y, x + p.x); }
    inline P operator-(P p) const { return P(y - p.y, x - p.x); }
    inline P operator+=(P p) { y += p.y; x += p.x; return *this; }
    inline P operator-=(P p) { y -= p.y; x -= p.x; return *this; }
};
inline ostream& operator<<(ostream& os, P p) { os << '(' << p.y << ',' << p.x << ')'; return os; }

const P FourMoving[] = { P(-1,0),P(0,1), P(1,0), P(0,-1) };
const P FiveMoving[] = { P(-1,0),P(0,1), P(1,0), P(0,-1), P(0,0) };
const P EightMoving[] = { P(-1,0),P(0,1), P(1,0), P(0,-1), P(-1,-1), P(-1,1), P(1,-1), P(1,1) };


template<typename T>
// using T = int;
struct F {
    int height, width;
    vector<T> data;

    F(int h = 1, int w = 1) :height(h), width(w), data(h*w) {}

    inline T& operator()(int y, int x) { return data[x + y * width]; }
    inline T& operator()(P p) { return data[p.x + p.y * width]; }
    inline T operator()(int y, int x) const { return data[x + y * width]; }
    inline T operator()(P p) const { return data[p.x + p.y * width]; }

    inline bool safe(int y, int x) const { return 0 <= y && y < height && 0 <= x && x < width; }
    inline bool safe(P p) const { return 0 <= p.y && p.y < height && 0 <= p.x && p.x < width; }

    inline void fill(T e) { std::fill(ALL(data), e); }
    inline void resize(int h, int w) { height = h; width = w; data.resize(h*w); }

    void print(ostream& os, int setw_arg = 4) {
        for (int y = 0; y < height; ++y) {
            for (int x = 0; x < width; ++x)
                os << setw(setw_arg) << operator()(y, x) << ' ';
            os << '\n';
        }
    }
};

/// <summary>
/// 全てのセルに対してstartからの距離を求める
/// </summary>
/// <param name="height">gridの高さ</param>
/// <param name="width">gridの幅</param>
/// <param name="start">開始地点</param>
/// <param name="costFunc">costFunc(curr, dest): 現在地点currから隣接点destに移動する時に掛かるコストを返す関数</param>
/// <returns>開始地点からの最短距離</returns>
F<ll> grid_tour(int height, int width, P start, function<ll(P, P)> costFunc) {
    priority_queue<pair<ll, P>> pque;
    
    F<ll> dist(height, width);
    dist.fill(numeric_limits<ll>::max());
    pque.emplace(0, start);
    dist(start) = 0;
    
    while (!pque.empty()) {
        auto dx = pque.top(); pque.pop();
        dx.first = -dx.first;

        for (auto y : FourMoving) {
            y += dx.second;
            if (!dist.safe(y)) continue;
            auto c = costFunc(dx.second, y);
            if (c >= 0 && dist(y) > dx.first + c) {
                dist(y) = dx.first + c;
                pque.emplace(-(dx.first + c), y);
            }
        }
    }
    
    return dist;
}

int N, V, Oy, Ox;

int main() {
    scanner >> N >> V >> Ox >> Oy;
    --Oy, --Ox;

    F<int> field(N, N);
    repeat(i, N) repeat(j, N) scanner >> field(i, j);
    
    ll mujihi = field(N-1, N-1);

    auto dist = grid_tour(N, N, P(0, 0), [&](P from, P dest) {return field(dest); });
    if (dist(N - 1, N - 1) < V) bye("YES");
    if (dist(Oy, Ox) >= V || Oy == -1) bye("NO");
    auto dist2 = grid_tour(N, N, P(Oy, Ox), [&](P from, P dest) {return field(dest); });

    if (dist2(N - 1, N - 1) < (V - dist(Oy, Ox)) * 2) bye("YES");
    bye("NO");

    return 0;
}

yukicoder

結果

テストケース

ソースコード