Submission #1293878

#	Time	Username	Problem	Language	Result	Execution time	Memory
1293878		fairkrash	Dango Maker (JOI18_dango_maker)	C++20	33 / 100	2105 ms	233372 KiB

dango_maker

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

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

vector<vector<ll>> g;

vector<ll> p;
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++) {
        ll to = g[v][i];
        if (p[to] == -1 || kun(p[to])) {
            p[to] = v;
            return true;
        }
    }
    return false;
}


int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    ll n, m;
    cin >> n >> m;
    vector<string> s(n);
    vector<vector<ll>> pref(n, vector<ll>(m, -1));
    for (ll i = 0; i < n; i++) {
        cin >> s[i];
    }
    ll cnt1 = 0;
    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') {
                        pref[i][j] = cnt1;
                        pref[i][j + 1] = cnt1;
                        pref[i][j + 2] = cnt1;
                        cnt1++;
                    }
                }
            }
        }
    }
    ll cnt2 = 0;
    for (ll i = 0; i < n; i++) {
        for (ll j = 0; j < m; j++) {
            if (s[i][j] == 'R') {
                if (i + 2 < n) {
                    if (s[i + 1][j] == 'G' && s[i + 2][j] == 'W') {
                        vector<ll> q;
                        if (pref[i][j] != -1) {
                            q.push_back(pref[i][j]);
                        }
                        if (pref[i + 1][j] != -1) {
                            q.push_back(pref[i + 1][j]);
                        }
                        if (pref[i + 2][j] != -1) {
                            q.push_back(pref[i + 2][j]);
                        }
                        g.push_back(q);
                        cnt2++;
                    }
                }
            }
        }
    }
    p.assign(cnt1 + 1, -1);
    used.assign(cnt2 + 1, 0);
    ll col = cnt1 + cnt2;
    ll d = 0;
    for (ll i = 0; i < cnt2; i++) {
        tt++;
        if (kun(i)) {
            d++;
        }
    }
    cout << col - d;
}

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