結果

問題 No.2928 Gridpath
コンテスト
ユーザー yasunori
提出日時 2024-10-12 15:04:20
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 4 ms / 2,000 ms
コード長 4,525 bytes
コンパイル時間 2,099 ms
コンパイル使用メモリ 206,160 KB
最終ジャッジ日時 2025-02-24 17:51:59
ジャッジサーバーID
（参考情報） 		judge4 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 20
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <bits/stdc++.h>
using namespace std;
template <typename T> using min_priority_queue = priority_queue<T,vector<T>,greater<T>>;

random_device seed_gen;
mt19937 engine(seed_gen());

int64_t get_time(){
    struct::timespec t;
    clock_gettime(CLOCK_MONOTONIC, &t);
    return t.tv_sec * int64_t(1'000'000'000) + t.tv_nsec;
}

template<typename T>
void invec(vector<T> &v){
    for(auto &i : v) cin >> i;
    return;
}

template<typename T>
void outvec(vector<T> &v, string s = " "){
    bool b = false;
    for(auto i : v){
        if(b) cout << s;
        else b = true;
        cout << i;
    }
    cout << endl;
    return;
}

template <typename T>
bool chmin(T &a, const T& b) {
    if (a > b) {
        a = b;  // aをbで更新
        return true;
    }
    return false;
}

template <typename T>
bool chmax(T &a, const T& b) {
    if (a < b) {
        a = b;  // aをbで更新
        return true;
    }
    return false;
}

bool yn(bool b){
    if(b) cout << "Yes" << endl;
    else cout << "No" << endl;
    return b;
}

bool check_with_simple_solution;
bool calc_time;
bool random_input;
bool debug_output;
int num_of_testcase;

using ans_type = int;

void input(){
    if(num_of_testcase > 1){
    }
    if(random_input){
    }   
    else{
    }
    return;
}

void output_input(){
    return;
}

void pre_solve(){
    return;
}

int si, sj, gi, gj;
vector<pair<int,int>> dir = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
void dfs(vector<vector<int>> &V, int x, int y, int &ans) {
    if(debug_output) {
        for(auto i : V) {
            for(auto j : i) {
                cout << j << " ";
            }
            cout << endl;
        }
        cout << x << " " << y << endl;
        cout << ans << endl;
    }
    if(x == gi && y == gj) {
        ans++;
        return;
    }

    int h = V.size();
    int w = V[0].size();
    vector<int> A;
    for(int i = 0; i < 4; i++) {
        auto [dx, dy] = dir[i];
        int nx = x + dx;
        int ny = y + dy;
        if(nx < 0 || h <= nx || ny < 0 || w <= ny) continue;
        if(V[nx][ny] != 0) continue;
        A.push_back(i);
    }

    int m = A.size();
    for(int i = 0; i < m; i++) {
        auto [dx, dy] = dir[A[i]];
        int nx = x + dx;
        int ny = y + dy;
        for(int j = 0; j < m; j++) {
            auto [dx2, dy2] = dir[A[j]];
            int x2 = x + dx2;
            int y2 = y + dy2;
            if(j != i) V[x2][y2] = -1;
            else V[x2][y2] = 1;
        }
        dfs(V, nx, ny, ans);
        for(int j = 0; j < m; j++) {
            auto [dx2, dy2] = dir[A[j]];
            int x2 = x + dx2;
            int y2 = y + dy2;
            V[x2][y2] = 0;
        }
    }
    return;
}

ans_type solve(){
    int h, w; cin >> h >> w;
    cin >> si >> sj >> gi >> gj;
    si--; sj--; gi--; gj--;

    int ans = 0;
    vector<vector<int>> V(h, vector<int>(w, 0));
    V[si][sj] = 1;
    dfs(V, si, sj, ans);

    cout << ans << endl;
    return ans_type();
}

ans_type solve_simple(){
    return ans_type();
}

void output(ans_type ans){
    return;
}

int main(){
    ios::sync_with_stdio(false);
	cin.tie(nullptr);
    cout << fixed << setprecision(20);

    check_with_simple_solution = 0;
    calc_time = 0;
    random_input = 0;
    debug_output = 0;
    num_of_testcase = 1;
    
    if(num_of_testcase == 0) cin >> num_of_testcase;

    pre_solve();

    if(check_with_simple_solution){
        for(int i = 0; i < num_of_testcase; i++){
            if(debug_output) cout << "begin case " << i << " " << string(16, '=') << endl;
            input();
            ans_type ans = solve();
            if(debug_output) cout << string(16, '=') << endl;
            ans_type ans_simple = solve_simple();
            if(ans != ans_simple){
                cout << "input: " << endl;
                output_input();
                cout << "output: " << endl;
                output(ans);
                cout << "expected: " << endl;
                output(ans_simple);
            }
            if(debug_output) cout << "end case " << i << " " << string(16, '=') << endl;
        }
    }
    else{
        int64_t time_start = get_time();
        for(int i = 0; i < num_of_testcase; i++){
            input();
            output(solve());
        }
        int64_t time_end = get_time();

        if(calc_time){
            double time_per_case = (time_end - time_start) / (1e9 * num_of_testcase);
            cout << fixed << setprecision(3) << time_per_case << "[second/case]" << endl;
        }
    }

    return 0;
}
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