Submission #220711

#	Time	Username	Problem	Language	Result	Execution time	Memory
220711		Vimmer	Skandi (COCI20_skandi)	C++14	50 / 110	10053 ms	44416 KiB

Main

#include <bits/stdc++.h>

//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define N 500005
#define MOD ll(998244353)

using namespace std;

typedef long long ll;

typedef long double ld;



int mt[N], idr[505][505][2];

pair <int, int> conv[N][2];

bool lft[N];

set <int> g[N];


bool mk[N], mkr[N], was[N];

bool kuna(int v)
{
    if (mk[v]) return 0;

    mk[v] = 1;

    for (auto it : g[v])
    {
        if (mt[it] == -1 || kuna(mt[it]))
            {
                mt[it] = v;

                was[v] = 1;

                return 1;
            }
    }

    return 0;
}

void dfs(int v, int tp)
{
    mkr[v] = 1;

    if (!tp)
    {
        for (auto it : g[v])
            if (!mkr[it]) dfs(it, 1);
    }
    else if (mt[v] != -1) dfs(mt[v], 0);
}
int main()
{
    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n, m;

    cin >> n >> m;

    string s[n];

    for (int i = 0; i < n; i++) cin >> s[i];

    int id = 0;

    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++) {conv[id][0] = {i, j}; idr[i][j][0] = id++; lft[id] = 1; conv[id][1] = {i, j}; idr[i][j][1] = id++;}

    for (int i = 0; i < n; i++)
        for (int j = 0; j < m; j++)
          if (s[i][j] == '0')
            {
                int x = i;

                while (s[x][j] == '0') x--;

                int y = j;

                while (s[i][y] == '0') y--;

                g[idr[x][j][1]].insert(idr[i][y][0]);
            }

    memset(mt, -1, sizeof(mt));

    for (int i = 0; i < N; i++)
    {
        if (sz(g[i]) == 0 || was[i]) continue;

        memset(mk, 0, sizeof(mk));

        was[i] = kuna(i);
    }

    vector <pair <pair <int, int>, int> > ans; ans.clear();

    for (int i = 0; i < N; i++) if (mt[i] != -1) g[mt[i]].erase(i);

    for (int i = 0; i < N; i++) if (lft[i] && !was[i])
        dfs(i, 0);

    for (int i = 0; i < N; i++)
    {
        if (lft[i] && !mkr[i]) ans.pb({conv[i][1], 1});

        if (mkr[i] && !lft[i]) ans.pb({conv[i][0], 0});
    }
    cout << sz(ans) << endl;

    for (auto it : ans) cout << it.F.F + 1 << " " << it.F.S + 1 << " " << (it.S == 0 ? "DESNO" : "DOLJE") << endl;
}

• Subtask 1: 18 / 18
• Subtask 2: 32 / 32
• Subtask 3: 0 / 60