Submission #552822

#TimeUsernameProblemLanguageResultExecution timeMemory
552822StickfishChess Rush (CEOI20_chessrush)C++17
36 / 100
2076 ms4180 KiB
#include <iostream>
#include "arithmetics.h"
#include <vector>
#include <cassert>
using namespace std;
using ll = long long;

pair<int, int> pawn(int r, int c, int j0, int j1) {
    if (j0 == j1)
        return {r - 1, 1};
    else
        return {0, 0};
}

pair<int, int> rook(int r, int c, int j0, int j1) {
    if (j0 == j1)
        return {1, 1};
    else
        return {2, 2};
}

struct point {
    ll x, y;

    point(){}

    point(ll x_, ll y_): x(x_), y(y_) {}

    point operator/(ll t) const {
        return {x / t, y / t};
    }

    point operator*(ll t) const {
        return {x * t, y * t};
    }

    bool operator==(point pt) const {
        return x == pt.x && y == pt.y;
    }

    bool operator!=(point pt) const {
        return x != pt.x || y != pt.y;
    }

    ll operator*(point pt) const {
        return x * pt.y - y * pt.x;
    }

    ll operator^(point pt) const {
        return x * pt.x + y * pt.y;
    }

    point operator+(point pt) const {
        return {x + pt.x, y + pt.y};
    }

    point operator-(point pt) const {
        return {x - pt.x, y - pt.y};
    }

    point rotate_45_normal() {
        point ans(x - y, x + y);
        if (abs(x + y) == 2 || abs(x - y) == 2)
            return ans / 2;
        else
            return ans;
    }

    point rotate_90() {
        return {-y, x};
    }

};

pair<int, int> queen(int r, int c, int j0, int j1) {
    for (point dir(1, 0); dir != point(-1, 0); dir = dir.rotate_45_normal()) {
        //cout << "! " << dir.x << ' ' << dir.y << endl;
        if (dir * point(j1 - j0, r - 1) == 0)
            return {1, 1};
    }
    int cnt = 2;
    for (point dir(1, 1); dir != point(-1, -1); dir = dir.rotate_90()) {
        // (j0, 0) + dir * k = (j1, y0)
        ll y0 = (j1 - j0) / dir.x * dir.y;
        if (0 <= y0 && y0 < r)
            cnt += 2;
        // (j0, 0) + dir * k = (x1, r - 1)
        ll x1 = j0 + (r - 1) / dir.y * dir.x;
        if (0 <= x1 && x1 < c)
            ++cnt;
        // (x2, 0) + dir * k = (j1, r - 1)
        ll x2 = j1 - (r - 1) / dir.y * dir.x;
        if (0 <= x2 && x2 < c)
            ++cnt;
    }
    if ((j0 + j1 + r) % 2) {
        int jright = 2 * c - j1 - 1;
        if (point(jright - j0, r - 1) * point(1, 1) >= 0)
            ++cnt;
        int jleft = -j1 - 1;
        if (point(-1, 1) * point(jleft - j0, r - 1) >= 0)
            ++cnt;
    }
    return {2, cnt};
}

int choose(int n, int k) {
    if (k * 2 > n)
        return choose(n, n - k);
    int ans = 1;
    for (int p = n; p > n - k; --p) {
        ans = Mul(ans, p);
    }
    int fct = 1;
    for (int p = 1; p <= k; ++p) {
        fct = Mul(fct, p);
    }
    return Div(ans, fct);
}

pair<int, int> bishop_goleft(int r, int c, int j0, int j1) {
    if (j0 == 0 && j1 == c - 1 && r == c)
        return {1, 1};
    if (j0 == c - 1 && j1 == 0 && r == c)
        return {1, 1};
    int loopcnt = min(0, r / c / 2 - 3);
    point pt(0, j0 + loopcnt * (c - 1) * 2);
    int minmoves = 1 + loopcnt * 2;
    int rmv = 0;
    int lst = 0;
    while (true) {
        if ((point(j1, r - 1) - pt) * point(1, 1) >= 0) {
            ++minmoves;
            lst = r - 1 - pt.y;
            pt = pt + point(lst, lst);
            rmv = abs(j1 - pt.x) / 2;
            break;
        }
        minmoves += 2;
        pt = pt + point(c - 1, c - 1);
        if (point(-1, 1) * (point(j1, r - 1) - pt) >= 0) {
            lst = r - 1 - pt.y;
            pt = pt + point(-lst, lst);
            rmv = abs(j1 - pt.x) / 2;
            break;
        }
        pt = pt + point(1 - c, c - 1);
    }
    lst = c - 1 - lst;
    int cnt = 0;
    if (minmoves == 2)
        return {2, 1};
    for (int rm0 = 0; rm0 <= j0 && rm0 <= rmv; ++rm0) {
        int Cvl = 0;
        for (int rml = 0; rml <= lst && rm0 + rml <= rmv; ++rml) {
            //cout << "! " << ' ' << rmv << ' ' << rm0 << ' ' << rml << " : " << rmv - rm0 - rml << ' ' << minmoves - 2 << endl;
            if (rmv - rm0 - rml == 0) {
                ++cnt;
                continue;
            }
            if (minmoves == 3)
                continue;
            cnt = Add(cnt, choose(rmv - rm0 - rml + minmoves - 4, minmoves - 4));
        }
    }
    //cout << "---" << ' ' << minmoves << endl;
    return {minmoves, cnt};
}

pair<int, int> bishop(int r, int c, int j0, int j1) {
    if ((r + j0 + j1) % 2 == 0)
        return {0, 0};
    pair<int, int> ansup = bishop_goleft(r, c, j0, j1);
    pair<int, int> ansdown = bishop_goleft(r, c, c - j0 - 1, c - j1 - 1);
    if (ansup.first == ansdown.first)
        return {ansup.first, Add(ansup.second, ansdown.second)};
    return min(ansup, ansdown);
}

struct matrix {
    matrix(int sz_): sz(sz_), f(sz_, vector<int>(sz_, 0)) {}

    vector<int>& operator[](int i) {
        return f[i];
    }
    
    matrix operator*(matrix m) {
        matrix ans(sz);
        for (int i = 0; i < sz; ++i) {
            for (int j = 0; j < sz; ++j) {
                for (int t = 0; t < sz; ++t) {
                    ans[i][j] = Add(ans[i][j], Mul(m[t][j], f[i][t]));
                }
            }
        }
        return ans;
    }

    int sz;
    vector<vector<int>> f;
};

matrix pw(matrix a, int m) {
    if (m == 1)
        return a;
    if (m % 2)
        return a * pw(a, m - 1);
    return pw(a * a, m / 2);
}

signed main() {
    int r, c, q;
    cin >> r >> c >> q;
    matrix king_ans(c);
    for (int i = 0; i < c; ++i) {
        king_ans[i][i] = 1;
        if (i)
            king_ans[i][i - 1] = 1;
        if (i + 1 < c)
            king_ans[i][i + 1] = 1;
    }
    if (c <= 100)
        king_ans = pw(king_ans, r - 1);
    while (q--) {
        char t;
        int j0, j1;
        cin >> t >> j0 >> j1;
        --j0, --j1;
        pair<int, int> ans;
        if (t == 'P') {
            ans = pawn(r, c, j0, j1);
        } else if (t == 'Q') {
            ans = queen(r, c, j0, j1);
        } else if (t == 'R') {
            ans = rook(r, c, j0, j1);
        } else if (t == 'K') {
            ans = {r - 1, king_ans[j0][j1]};
        } else if (t == 'B') {
            ans = bishop(r, c, j0, j1);
        }
        cout << ans.first << ' ' << ans.second << '\n';
    }
}

Compilation message (stderr)

chessrush.cpp: In function 'std::pair<int, int> bishop_goleft(int, int, int, int)':
chessrush.cpp:154:13: warning: unused variable 'Cvl' [-Wunused-variable]
  154 |         int Cvl = 0;
      |             ^~~
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