Submission #901373

#	Time	Username	Problem	Language	Result	Execution time	Memory
901373		KienTran	Dango Maker (JOI18_dango_maker)	C++14	0 / 100	61 ms	262144 KiB

dango_maker

#include <bits/stdc++.h>
#define ii pair <int, int>
#define fi first.first
#define se first.second
#define th second

using namespace std;

const int O = 3e3 + 5;
const int base = 500;
const int mod = 998244353;

int n, m, cnt, cal, c[O][O], dd[2][O][O];
char a[O][O];

vector <pair <ii, int>> g[2][O][O];

void dfs(pair <ii, int> u){
    queue <pair <ii, int>> q;
    q.push(u);

    while (q.size()){
        u = q.front(); q.pop();
        cnt += u.fi == 0; cal += 1;
        dd[u.fi][u.se][u.th] = 1;
        for (auto v : g[u.fi][u.se][u.th]){
            if (!dd[v.fi][v.se][v.th]) q.push(v);
        }
    }
}

main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    cin >> n >> m;
    for (int i = 1; i <= n; ++ i){
        for (int j = 1; j <= m; ++ j){
            cin >> a[i][j];
            if (a[i][j] == 'W' && j >= 3){
                c[i][j - 2] += (a[i][j - 2] == 'R' && a[i][j - 1] == 'G');
            }

            if (a[i][j] == 'W' && i >= 3){
                c[i - 2][j] += 2 * (a[i - 2][j] == 'R' && a[i - 1][j] == 'G');
            }
        }
    }

    for (int i = 1; i <= n; ++ i){
        for (int j = 1; j <= m - 2; ++ j){
            if (c[i][j] & 1){
                if (i > 2 && (c[i - 2][j + 2] & 2)){
                    g[0][i][j].push_back(make_pair(make_pair(1, i - 2), j + 2));
                    g[1][i - 2][j + 2].push_back(make_pair(make_pair(0, i), j));
                }

                if (i > 1 && (c[i - 1][j + 1] & 2)){
                    g[0][i][j].push_back(make_pair(make_pair(1, i - 1), j + 1));
                    g[1][i - 1][j + 1].push_back(make_pair(make_pair(0, i), j));
                }

                if (c[i][j] & 2){
                    g[0][i][j].push_back(make_pair(make_pair(1, i), j));
                    g[1][i][j].push_back(make_pair(make_pair(0, i), j));
                }
            }
        }
    }

    int res = 0;
    for (int i = 1; i <= n; ++ i){
        for (int j = 1; j <= m; ++ j){
            if (c[i][j] > 0){
                cnt = cal = 0;
                if (c[i][j] & 1 && !dd[0][i][j]){
                    dfs(make_pair(make_pair(0, i), j));
                }
                else if (!dd[1][i][j]){
                    dfs(make_pair(make_pair(1, i), j));
                }

                res += max(cnt, cal - cnt);
            }
        }
    }

    cout << res;
}

Compilation message (stderr)

dango_maker.cpp:32:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   32 | main(){
      | ^~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 67