제출 #521971

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
521971		Monarchuwu	Dango Maker (JOI18_dango_maker)	C++17	0 / 100	108 ms	212084 KiB

dango_maker

#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
using namespace std;
typedef long long ll;

const int N = 3000 + 3, N2 = N * N, inf = 1e9 + 7;
int m, n;
char c[N][N];
vector<int> vertexX;

int cnt, num[2][N][N];
vector<int> g[N2];
void init_graph() {
    for (int i = 0; i < m; ++i)
        for (int j = 0; j < n; ++j) if (c[i][j] == 'G') {
            bool flag11(false), flag12(false), flag21(false), flag22(false);

            // check ngang
            if (j > 0 && j + 1 < n && c[i][j - 1] == 'R' && c[i][j + 1] == 'W') {
                num[0][i][j] = ++cnt;
                if (i & 1) vertexX.push_back(num[0][i][j]);

                if (num[1][i - 1][j + 1]) {
                    if (i & 1)
                        g[num[0][i][j]].push_back(num[1][i - 1][j + 1]);
                    else g[num[1][i - 1][j + 1]].push_back(num[0][i][j]);
                }
            }

            // check dọc
            if (i > 0 && i + 1 < m && c[i - 1][j] == 'R' && c[i + 1][j] == 'W') {
                num[1][i][j] = ++cnt;
                if (!(i & 1)) vertexX.push_back(num[1][i][j]);

                if (num[0][i - 1][j + 1]) {
                    if (!(i & 1))
                        g[num[1][i][j]].push_back(num[0][i - 1][j + 1]);
                    else g[num[0][i - 1][j + 1]].push_back(num[1][i][j]);
                }
            }

            if (num[0][i][j] && num[1][i][j]) {
                if (i & 1)
                    g[num[0][i][j]].push_back(num[1][i][j]);
                else g[num[1][i][j]].push_back(num[0][i][j]);
            }
        }
}

int mat[N2];
int dist[N2];
bool bfs() {
    queue<int> q;
    dist[0] = inf;
    for (int i : vertexX)
        if (mat[i]) dist[i] = inf;
        else {
            dist[i] = 0;
            q.push(i);
        }

    while (!q.empty()) {
        int u = q.front(); q.pop();
        for (int v : g[u]) {
            if (dist[mat[v]] == inf) {
                dist[mat[v]] = dist[u] + 1;
                q.push(mat[v]);
            }
        }
    }
    return dist[0] != inf;
}

bool dfs(int u) {
    for (int v : g[u]) {
        if (!mat[v] || (dist[mat[v]] == dist[u] + 1 && dfs(mat[v]))) {
            mat[v] = u, mat[u] = v;
            dist[u] = inf;
            return true;
        }
    }
    dist[u] = inf;
    return false;
}

int hopcroft_karp() {
    int ans(0);
    while (bfs()) {
        for (int i : vertexX)
            if (!mat[i] && dfs(i)) ++ans;
    }
    return ans;
}

int main() {
    cin.tie(NULL)->sync_with_stdio(false);
    cin >> m >> n;
    for (int i = 0; i < m; ++i) cin >> c[i];
    init_graph();

    cout << cnt - hopcroft_karp() << '\n';
}
/**  /\_/\
 *  (= ._.)
 *  / >0  \>1
**/
/*
==================================================+
INPUT:                                            |
--------------------------------------------------|
4 4
xxxRx
xxRGW
xRGWx
RGWxx
--------------------------------------------------|
==================================================+
OUTPUT:                                           |
--------------------------------------------------|

--------------------------------------------------|
==================================================+
*/

컴파일 시 표준 에러 (stderr) 메시지

dango_maker.cpp: In function 'void init_graph()':
dango_maker.cpp:18:18: warning: unused variable 'flag11' [-Wunused-variable]
   18 |             bool flag11(false), flag12(false), flag21(false), flag22(false);
      |                  ^~~~~~
dango_maker.cpp:18:33: warning: unused variable 'flag12' [-Wunused-variable]
   18 |             bool flag11(false), flag12(false), flag21(false), flag22(false);
      |                                 ^~~~~~
dango_maker.cpp:18:48: warning: unused variable 'flag21' [-Wunused-variable]
   18 |             bool flag11(false), flag12(false), flag21(false), flag22(false);
      |                                                ^~~~~~
dango_maker.cpp:18:63: warning: unused variable 'flag22' [-Wunused-variable]
   18 |             bool flag11(false), flag12(false), flag21(false), flag22(false);
      |                                                               ^~~~~~

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