Submission #217235

#	Time	Username	Problem	Language	Result	Execution time	Memory
217235		kartel	Matching (COCI20_matching)	C++14	11 / 110	505 ms	47368 KiB

matching

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-O3")
#define F first
#define S second
#define pb push_back
#define N +1000005
#define M ll(1e9 + 7)
#define sz(x) (int)x.size()
#define re return
#define oo ll(1e18)
#define el '\n'
using namespace std;
//using namespace __gnu_pbds;
//typedef tree <int, null_type, less_equal <int> , rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef long long ll;
typedef long double ld;

int x[N], y[N], n, i, mk[N], mask, j;
vector <int> g[N], G[N];

int main()
{
//    srand(time(0));
    ios_base::sync_with_stdio(0);
    iostream::sync_with_stdio(0);
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
//    in("data.in");
//    out("data.out");
    cin >> n;
    for (i = 0; i < n; i++)
    {
        cin >> x[i] >> y[i];
        g[x[i]].pb(i);
        G[y[i]].pb(i);
    }
    for (mask = 0; mask < (1 << n); mask++)
    {
        vector <pair <int, int> > hor, ver;
        for (i = 0; i < n; i++) mk[i] = 0;
        for (i = 0; i < n; i++)
        {
            if (mask & (1 << i))
            {
                if (g[x[i]].size() == 1) continue;
                int j = g[x[i]][1];
                if (mk[j] || i == j) continue;
                hor.pb({i, j});
                mk[i] = mk[j] = 1;
            }
            else
            {
                if (G[y[i]].size() == 1) continue;
                int j = G[y[i]][1];
                if (mk[j] || i == j) continue;
                mk[i] = mk[j] = 1;
                ver.pb({i, j});
            }
        }
        i = 0;
        while (i < n && mk[i]) i++;
        if (i < n) continue;

        bool f = 1;

        for (i = 0; i < hor.size(); i++)
            {
                int dx = min(x[hor[i].F], x[hor[i].S]);

                int dy = min(y[hor[i].F], y[hor[i].S]);
                int uy = max(y[hor[i].F], y[hor[i].S]);

                for (j = 0; j < ver.size(); j++)
                {
                    int lx = min(x[ver[j].F], x[ver[j].S]);
                    int rx = max(x[ver[j].F], x[ver[j].S]);

                    int ly = min(y[ver[j].F], y[ver[j].S]);

                    if (dx >= lx && dx <= rx && dy < ly && uy > ly) f = 0;
                }
            }
        if (!f) continue;

        cout << "DA" << el;
        for (auto x : hor) cout << x.F + 1 << " " << x.S + 1 << el;
        for (auto x : ver) cout << x.F + 1 << " " << x.S + 1 << el;
        return 0;
    }
    cout << "NE";
}

Compilation message (stderr)

matching.cpp: In function 'int main()':
matching.cpp:73:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (i = 0; i < hor.size(); i++)
                     ~~^~~~~~~~~~~~
matching.cpp:80:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for (j = 0; j < ver.size(); j++)
                             ~~^~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 6 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 40
• Subtask 5: 0 / 52