Submission #1293779

#	Time	Username	Problem	Language	Result	Execution time	Memory
1293779		fairkrash	Dango Maker (JOI18_dango_maker)	C++20	13 / 100	1 ms	584 KiB

dango_maker

#include <bits/stdc++.h>
#include <random>

using namespace std;
using ll = int;
using ld = long double;
ll INF = 1e9;

const ll MX = 3001;

vector<vector<pair<ll, ll>>> g;

vector<ll> p_g;
vector<ll> p_w;
vector<ll> used;

ll tt = 1;


bool kun(ll v) {
    if (used[v] == tt) {
        return false;
    }
    used[v] = tt;
    for (ll i = 0; i < g[v].size(); i++) {
        if (p_g[g[v][i].first] == -1 && p_w[g[v][i].second] == -1) {
            p_g[g[v][i].first] = v;
            p_w[g[v][i].second] = v;
            return true;
        }
    }
    for (ll i = 0; i < g[v].size(); i++) {
        if (p_g[g[v][i].first] != -1) {
            if (kun(p_g[g[v][i].first])) {
                if (p_w[g[v][i].second] != -1) {
                    if (kun(p_w[g[v][i].second])) {
                        p_g[g[v][i].first] = v;
                        p_w[g[v][i].second] = v;
                        return true;
                    } else {
                        p_g[g[v][i].first] = -1;
                    }
                } else {
                    p_g[g[v][i].first] = v;
                    p_w[g[v][i].second] = v;
                    return true;
                }
            }
        }
    }
    return false;
}


int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    ll n, m;
    cin >> n >> m;
    ll v1 = 0, v2 = 0, v3 = 0;
    vector<string> s(n);
    vector<vector<ll>> color(n, vector<ll>(m));
    for (ll i = 0; i < n; i++) {
        cin >> s[i];
    }
    for (ll i = 0; i < n; i++) {
        for (ll j = 0; j < m; j++) {
            if (s[i][j] == 'R') {
                color[i][j] = v1;
                v1++;
            }
            if (s[i][j] == 'G') {
                color[i][j] = v2;
                v2++;
            }
            if (s[i][j] == 'W') {
                color[i][j] = v3;
                v3++;
            }
        }
    }
    used.assign(v1 + 1, {});
    g.assign(v1 + 1, {});
    p_g.assign(v2 + 1, -1);
    p_w.assign(v3 + 1, -1);
    for (ll i = 0; i < n; i++) {
        for (ll j = 0; j < m; j++) {
            if (s[i][j] == 'R') {
                if (j + 2 < m) {
                    if (s[i][j + 1] == 'G' && s[i][j + 2] == 'W') {
                        g[color[i][j]].emplace_back(color[i][j + 1], color[i][j + 2]);
                    }
                }
                if (i + 2 < n) {
                    if (s[i + 1][j] == 'G' && s[i + 2][j] == 'W') {
                        g[color[i][j]].emplace_back(color[i + 1][j], color[i + 2][j]);
                    }
                }
            }
        }
    }
    ll ans = 0;
    for (ll i = 0; i < g.size(); i++) {
        tt++;
        if (kun(i)) {
            ans++;
        }
    }
    cout << ans;
}

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