Submission #442383

#	Time	Username	Problem	Language	Result	Execution time	Memory
442383		elazarkoren	Game (eJOI20_game)	C++17	20 / 100	1091 ms	16656 KiB

game

#include <iostream>
#include <vector>
#include <algorithm>
#include <bitset>
#define chkmin(a, b) a = min(a, b)
#define chkmax(a, b) a = max(a, b)
#define x first
#define y second
//#define int short
using namespace std;
typedef vector<short> vi;
typedef vector<vi> vvi;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef pair<short, short> pii;

const short MAX_N = 21;
const short infinity = 1e3;

bitset<MAX_N> edges1[MAX_N], edges2[MAX_N];
short id1[MAX_N][MAX_N], id2[MAX_N][MAX_N];

short n, m;

inline bool IsEdge1(short i, short j, int bit) {
    if (edges1[i][j]) return true;
    if (id1[i][j] != -1) return !((bit >> id1[i][j]) & 1);
    return false;
}

inline bool IsEdge2(short i, short j, int bit) {
    if (edges2[i][j]) return true;
    if (id2[i][j] != -1) return !((bit >> id2[i][j]) & 1);
    return false;
}

inline bool Inside(short i, short j, int bit) {
    if (i < 0 || i >= n || j < 0 || j >= m) return false;
    return IsEdge1(i, j, bit) && IsEdge1(i + 1, j, bit) && IsEdge2(i, j, bit) && IsEdge2(i, j + 1, bit);
}

int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> m;
//    edges1.resize(n + 1, vb(m)), edges2.resize(n, vb(m + 1));
    vector<pair<pii, bool>> edges;
//    id1.resize(n + 1, vi(m, -1)), id2.resize(n, vi(m + 1, -1));
    char c;
    for (short i = 0; i <= n; i++) {
        for (short j = 0; j < m; j++) {
            cin >> c;
            if (c == '0') {
                id1[i][j] = edges.size();
                edges.push_back({{i, j}, false});
            } else {
                edges1[i][j] = true;
                id1[i][j] = -1;
            }
        }
    }
    for (short i = 0; i < n; i++) {
        for (short j = 0; j <= m; j++) {
            cin >> c;
            if (c == '0') {
                id2[i][j] = edges.size();
                edges.push_back({{i, j}, true});
            } else {
                id2[i][j] = -1;
                edges2[i][j] = true;
            }
        }
    }
    short sz = edges.size();
    int pow = 1 << sz;
    vi dp1(pow, -infinity), dp2(pow, infinity);
    dp1[0] = dp2[0] = 0;
    for (int32_t i = 1; i < pow; i++) {
        for (int j = 0; j < sz; j++) {
            if (!((i >> j) & 1)) continue;
            short squares = 0;
            int sub = i - (1 << j);
            if (edges[j].y) {
                squares = Inside(edges[j].x.x, edges[j].x.y, sub) + Inside(edges[j].x.x, edges[j].x.y - 1, sub);
            } else {
                squares = Inside(edges[j].x.x, edges[j].x.y, sub) + Inside(edges[j].x.x - 1, edges[j].x.y, sub);
            }
            chkmax(dp1[i], short ((squares ? dp1[sub] : dp2[sub]) + squares));
            chkmin(dp2[i], short ((squares ? dp2[sub] : dp1[sub]) - squares));
        }
    }
    cout << dp1[pow - 1];
}
//2 2
//11
//01
//11
//100
//100

//3 2
//00
//10
//11
//11
//011
//001
//000

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