Submission #442208

#	Time	Username	Problem	Language	Result	Execution time	Memory
442208		elazarkoren	Game (eJOI20_game)	C++17	0 / 100	1096 ms	204 KiB

game

#include <iostream>
#include <vector>
#include <algorithm>
#define x first
#define y second
#define all(v) v.begin(), v.end()
#define chkmin(a, b) a = min(a, b)
#define chkmax(a, b) a = max(a, b)
using namespace std;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;
typedef vector<pii> vii;
typedef vector<bool> vb;
typedef vector<vb> vvb;

const int infinity = 1e9;

int n, m;

vvb hor_edge, ver_edge;

inline int Val(int i, int j) {
    return i + j * n;
}

inline bool Inside(int i, int j) {
    if (i < 0 || i >= n || j < 0 || j >= m) return false;
    return hor_edge[i][j] && hor_edge[i + 1][j] && ver_edge[i][j] && ver_edge[i][j + 1];
}

int Solve(bool player1, int sa, int st) {
    int ans = player1 ? -1 : infinity;
    for (int i = 0; i <= n; i++) {
        for (int j = 0; j < m; j++) {
            if (!hor_edge[i][j]) {
                hor_edge[i][j] = true;
                bool b1 = Inside(i, j);
                bool b2 = Inside(i - 1, j);
                if (player1) sa += b1 + b2;
                else st += b1 + b2;
                int val = Solve((b1 || b2) ? player1 : !player1, sa, st);
                if (player1) chkmax(ans, val);
                else chkmin(ans, val);
                hor_edge[i][j] = false;
            }
        }
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= m; j++) {
            if (!ver_edge[i][j]) {
                ver_edge[i][j] = true;
                bool b1 = Inside(i, j);
                bool b2 = Inside(i, j - 1);
                if (player1) sa += b1 + b2;
                else st += b1 + b2;
                int val = Solve((b1 || b2) ? player1 : !player1, sa, st);
                if (player1) chkmax(ans, val);
                else chkmin(ans, val);
                ver_edge[i][j] = false;
            }
        }
    }
    if (ans == -1 || ans == infinity) return sa - st;
    return ans;
}

int Dfs(vvi &graph, int node, vb &visited) {
    visited[node] = true;
    int ans = 1;
    for (int neighbor : graph[node]) {
        if (!visited[neighbor]) ans += Dfs(graph, neighbor, visited);
    }
    return ans;
}

int main() {
    cin >> n >> m;
    hor_edge.resize(n + 1, vb(m)), ver_edge.resize(n, vb(m + 1));
    for (int i = 0; i <= n; i++) {
        for (int j = 0; j < m; j++) {
            char c;
            cin >> c;
            hor_edge[i][j] = c == '1';
        }
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= m; j++) {
            char c;
            cin >> c;
            ver_edge[i][j] = c == '1';
        }
    }
    vvi graph(n * m);
    vb visited(n * m);
//    int ans = n * m;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (i < n - 1 && !hor_edge[i + 1][j]) {
                graph[Val(i, j)].push_back(Val(i + 1, j));
                graph[Val(i + 1, j)].push_back(Val(i, j));
            }
            if (j < m - 1 && !ver_edge[i][j + 1]) {
                graph[Val(i, j)].push_back(Val(i, j + 1));
                graph[Val(i, j + 1)].push_back(Val(i, j));
            }
            if (hor_edge[i][j] && hor_edge[i + 1][j] && ver_edge[i][j] && ver_edge[i][j + 1]) {
                visited[Val(i, j)] = true;
            }
        }
    }
    cout << Solve(true, 0, 0);
//    vi components;
//    for (int i = 0; i < n * m; i++) {
//        if (!visited[i]) components.push_back(Dfs(graph, i, visited));
//    }
//    sort(all(components));
//    int sz = components.size();
//    vi dp1(1 << sz, infinity);
//    vi dp2(1 << sz, infinity);
//    dp1[0] = dp2[0] = 0;
//    for (int i = 1; i < (1 << sz); i++) {
//        int sum = 0;
//        for (int j = 0; j < sz; j++) {
//            if ((i >> j) & 1) {
//                sum += components[j];
//                chkmin(dp1[i], dp2[i - (1 << j)] + components[j]);
//                chkmin(dp2[i], dp1[i - (1 << j)] + components[j]);
//            }
//        }
//        dp1[i] = sum - dp1[i];
//        dp2[i] = sum - dp2[i];
//    }
//    int sum = 0;
//    for (int i = 0; i < sz; i++) sum += components[i];
//    cout << dp1[(1 << sz) - 1] - (sum - dp1[(1 << sz) - 1]);
//    int sa = 0, st = 0;
//    for (int i = 0; i < components.size(); i++) {
//        if (i & 1) {
//            sa += components[i];
//        } else {
//            st += components[i];
//        }
//    }
//    cout << sa - st;
//    cout << -ans;
    return 0;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20