oj.uz

Submission #218750

# Submission time Handle Problem Language Result Execution time Memory
218750 2020-04-02T17:01:12 Z Vimmer Matching (COCI20_matching) C++14
58 / 110
 2500 ms 428928 KB 
#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 100001

using namespace std;

int x[N], y[N], a[N][2], n, xr[N], yr[N];

set <int> tx[N * 4], ty[N * 4], alone;

set <pair <int, int> > tx_del[N * 4], ty_del[N * 4];

vector <pair <int, char> > psh[N * 4];

vector <pair <pair <int, int>, char>  > psh_del[N * 4];

bool mk[N], mkr[N][2];

vector <pair <int, int> > g, gr;

void Push(int v, int tl, int tr)
{
    while (sz(psh[v]) > 0)
    {
        pair <int, char> val = psh[v].back();

        psh[v].pop_back();

        if (val.S == 'a') tx[v].insert(val.F); else ty[v].insert(val.F);

        if (tl != tr) {psh[v + v].pb(val); psh[v + v + 1].pb(val);}
    }

}
void upd(int v, int tl, int tr, int l, int r, int val, bool f)
{
    Push(v, tl, tr);

    if (tl > tr || l > r || r < tl || tr < l) return;

    if (l <= tl && tr <= r) {if (!f) psh[v].pb({val, 'a'}); else psh[v].pb({val, 'b'}); Push(v, tl, tr); return;}

    int md = (tl + tr) >> 1;

    upd(v + v, tl, md, l, r, val, f);

    upd(v + v + 1, md + 1, tr, l, r, val, f);
}

void Push_del(int v, int tl, int tr)
{
    while (sz(psh_del[v]) > 0)
    {
        pair <pair <int, int>, char>  pt = psh_del[v].back();

        psh_del[v].pop_back();

        if (pt.S == 'a') tx_del[v].insert(pt.F); else if (pt.S == 'b') ty_del[v].insert(pt.F);
          else if (pt.S == 'c') tx_del[v].erase(pt.F); else ty_del[v].erase(pt.F);

        if (tl != tr) {psh_del[v + v].pb(pt); psh_del[v + v + 1].pb(pt); }
    }
}

void upd_del(int v, int tl, int tr, int l, int r, pair <int, int> val, bool f)
{
    Push_del(v, tl, tr);

    if (tl > tr || l > r || r < tl || tr < l) return;

    if (l <= tl && tr <= r) {if (!f) psh_del[v].pb({val, 'a'}); else psh_del[v].pb({val, 'b'}); Push_del(v, tl, tr); return;}

    int md = (tl + tr) >> 1;

    upd_del(v + v, tl, md, l, r, val, f);

    upd_del(v + v + 1, md + 1, tr, l, r, val, f);
}

void upd_remove(int v, int tl, int tr, int l, int r, pair <int, int> val, bool f)
{
    Push_del(v, tl, tr);

    if (tl > tr || l > r || r < tl || tr < l) return;

    if (l <= tl && tr <= r) {if (!f) psh_del[v].pb({val, 'c'}); else psh_del[v].pb({val, 'd'}); Push_del(v, tl, tr); return;}

    int md = (tl + tr) >> 1;

    upd_remove(v + v, tl, md, l, r, val, f);

    upd_remove(v + v + 1, md + 1, tr, l, r, val, f);
}

bool good(int v, int tl, int tr, int pos, int l, int r, bool f)
{
    Push(v, tl, tr);

    if (tl == tr)
    {
        set <int> :: iterator it;

        if (f)
        {
            it = ty[v].lower_bound(l);

            return (it == ty[v].end() ? 1 : *it > r);
        }
        else
        {
            it = tx[v].lower_bound(l);

            return (it == tx[v].end() ? 1 : *it > r);
        }
    }
    else
    {
        int md = (tl + tr) >> 1;

        if (pos <= md) return good(v + v, tl, md, pos, l, r, f);

        return good(v + v + 1, md + 1, tr, pos, l, r, f);
    }
}

int good_del(int v, int tl, int tr, int pos, int l, int r, bool f)
{
    Push_del(v, tl, tr);

    if (tl == tr)
    {
        set <pair <int, int> > :: iterator it;

        if (f)
        {
            it = ty_del[v].lower_bound({l, -1e9});

            if (it == ty_del[v].end() || (*it).F > r) return -1;

            return (*it).S;
        }
        else
        {
            it = tx_del[v].lower_bound({l, -1e9});

            if (it == tx_del[v].end() || (*it).F > r) return -1;

            return (*it).S;
        }
    }
    else
    {
        int md = (tl + tr) >> 1;

        if (pos <= md) return good_del(v + v, tl, md, pos, l, r, f);

        return good_del(v + v + 1, md + 1, tr, pos, l, r, f);
    }
}

bool gd(int fr, int sc)
{
    if (x[fr] == x[sc])
    {
        if (y[fr] > y[sc]) swap(fr, sc);

        return good(1, 1, N - 1, x[fr], y[fr], y[sc], 0);
    }
    else
    {
        if (x[fr] > x[sc]) swap(fr, sc);

        return good(1, 1, N - 1, y[fr], x[fr], x[sc], 1);
    }
}

void add_remove(int fr, int sc, int nm)
{
    if (!mk[fr]) alone.insert(fr);

    if (!mk[sc]) alone.insert(sc);

    if (x[fr] == x[sc])
    {
        if (y[fr] > y[sc]) swap(fr, sc);

        upd_remove(1, 1, N, y[fr], y[sc], {x[fr], nm }, 1);
    }
    else
    {
        if (x[fr] > x[sc]) swap(fr, sc);

        upd_remove(1, 1, N, x[fr], x[sc], {y[fr], nm }, 0);
    }
}

void seacrh(int fr, int sc)
{
    if (x[fr] == x[sc])
    {
        if (y[fr] > y[sc]) swap(fr, sc);

        int pt = good_del(1, 1, N, x[fr], y[fr], y[sc], 0);

        while (pt != -1)
        {
            add_remove(gr[pt].F, gr[pt].S, pt);

            pt = good_del(1, 1, N, x[fr], y[fr], y[sc], 0);
        }
    }
    else
    {
        if (x[fr] > x[sc]) swap(fr, sc);

        int pt = good_del(1, 1, N, y[fr], x[fr], x[sc], 1);

        while (pt != -1)
        {
            add_remove(gr[pt].F, gr[pt].S, pt);

            pt = good_del(1, 1, N, y[fr], x[fr], x[sc], 1);
        }
    }
}

void add(int fr, int sc)
{
    if (x[fr] == x[sc])
    {
        g.pb({fr, sc});

        if (y[fr] > y[sc]) swap(fr, sc);

        upd(1, 1, N - 1, y[fr], y[sc], x[fr], 1);

        seacrh(fr, sc);
    }
    else
    {
        g.pb({fr, sc});

        if (x[fr] > x[sc]) swap(fr, sc);

        upd(1, 1, N - 1, x[fr], x[sc], y[fr], 0);

        seacrh(fr, sc);
    }
}

void clr(int x)
{
    mk[x] = 1;

    if (a[x][1] != -1) {if (!mk[a[x][1]])  alone.insert(a[x][1]); a[x][1] = a[a[x][1]][1] = -1;}

    if (a[x][0] != -1) {if (!mk[a[x][0]])  alone.insert(a[x][0]); a[x][0] = a[a[x][0]][0] = -1;}
}


void fnd()
{
    while (sz(alone) > 0)
    {
        int v = *alone.begin();

        alone.erase(alone.begin());

        if (mk[v]) continue;

        if (a[v][1] != -1 && gd(v, a[v][1])) {add(v, a[v][1]); clr(a[v][1]); clr(v); continue;}

        if (a[v][0] != -1 && gd(v, a[v][0])) {add(v, a[v][0]); clr(a[v][0]); clr(v); continue;}

        cout << "NE" << endl;

        exit(0);
    }

    for (int i = 0; i < n; i++)
    {
        if (mk[i]) continue;

        g.pb({i, a[i][0]});

        clr(a[i][0]);

        clr(i);
    }
}

void add_del(int fr, int sc)
{
    if (x[fr] == x[sc])
    {
        if (mkr[fr][0]) return;

        mkr[fr][0] = 1;

        mkr[sc][0] = 1;

        if (y[fr] > y[sc]) swap(fr, sc);

        upd_del(1, 1, N, y[fr], y[sc], {x[fr], sz(gr) }, 1);

        gr.pb({fr, sc});
    }
    else
    {
        if (mkr[fr][1]) return;

        mkr[fr][1] = 1;

        mkr[sc][1] = 1;

        if (x[fr] > x[sc]) swap(fr, sc);

        upd_del(1, 1, N, x[fr], x[sc], {y[fr], sz(gr) }, 0);

        gr.pb({fr, sc});
    }
}
int main()
{
    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n;

    for (int i = 1; i < N; i++) xr[i] = yr[i] = -1;

    for (int i = 0; i < n; i++) {cin >> x[i] >> y[i]; a[i][0] = a[i][1] = -1;}

    for (int i = 0; i < n; i++)
        {
            int X = x[i], Y = y[i];

            if (xr[X] == -1) xr[X] = i; else {a[i][0] = xr[X]; a[xr[X]][0] = i;}

            if (yr[Y] == -1) yr[Y] = i; else {a[i][1] = yr[Y]; a[yr[Y]][1] = i;}
        }

    for (int i = 0; i < n; i++)
    {
        if (a[i][0] == a[i][1] && a[i][1] == -1) {cout << "NE" << endl; exit(0);}

        if (a[i][0] == -1 || a[i][1] == -1) alone.insert(i); else {add_del(i, a[i][0]); add_del(i, a[i][1]);}
    }

    fnd();

    if (sz(g) != n / 2) {cout << "NE" << endl; exit(0);}

    cout << "DA" << endl;

    for (auto it : g) cout << it.F + 1 << " " << it.S + 1 << endl;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 60 ms 95224 KB Output is correct
2 Correct 66 ms 95224 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 60 ms 95224 KB Output is correct
2 Correct 66 ms 95224 KB Output is correct
3 Correct 61 ms 95224 KB Output is correct
4 Correct 61 ms 95224 KB Output is correct
5 Correct 59 ms 95096 KB Output is correct
6 Correct 60 ms 95224 KB Output is correct
7 Correct 58 ms 95096 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 60 ms 95224 KB Output is correct
2 Correct 66 ms 95224 KB Output is correct
3 Correct 61 ms 95224 KB Output is correct
4 Correct 61 ms 95224 KB Output is correct
5 Correct 59 ms 95096 KB Output is correct
6 Correct 60 ms 95224 KB Output is correct
7 Correct 58 ms 95096 KB Output is correct
8 Correct 60 ms 95608 KB Output is correct
9 Correct 71 ms 95356 KB Output is correct
10 Correct 60 ms 95352 KB Output is correct
11 Correct 59 ms 95224 KB Output is correct
12 Correct 60 ms 95352 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 60 ms 95224 KB Output is correct
2 Correct 66 ms 95224 KB Output is correct
3 Correct 61 ms 95224 KB Output is correct
4 Correct 61 ms 95224 KB Output is correct
5 Correct 59 ms 95096 KB Output is correct
6 Correct 60 ms 95224 KB Output is correct
7 Correct 58 ms 95096 KB Output is correct
8 Correct 60 ms 95608 KB Output is correct
9 Correct 71 ms 95356 KB Output is correct
10 Correct 60 ms 95352 KB Output is correct
11 Correct 59 ms 95224 KB Output is correct
12 Correct 60 ms 95352 KB Output is correct
13 Correct 91 ms 102392 KB Output is correct
14 Correct 99 ms 102904 KB Output is correct
15 Correct 98 ms 102420 KB Output is correct
16 Correct 102 ms 102776 KB Output is correct
17 Correct 108 ms 103032 KB Output is correct
18 Correct 96 ms 102264 KB Output is correct
19 Correct 105 ms 102904 KB Output is correct
20 Correct 92 ms 102300 KB Output is correct
21 Correct 90 ms 102008 KB Output is correct
22 Correct 91 ms 102136 KB Output is correct
23 Correct 320 ms 155640 KB Output is correct
24 Correct 318 ms 154360 KB Output is correct

Subtask #5
0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 60 ms 95224 KB Output is correct
2 Correct 66 ms 95224 KB Output is correct
3 Correct 61 ms 95224 KB Output is correct
4 Correct 61 ms 95224 KB Output is correct
5 Correct 59 ms 95096 KB Output is correct
6 Correct 60 ms 95224 KB Output is correct
7 Correct 58 ms 95096 KB Output is correct
8 Correct 60 ms 95608 KB Output is correct
9 Correct 71 ms 95356 KB Output is correct
10 Correct 60 ms 95352 KB Output is correct
11 Correct 59 ms 95224 KB Output is correct
12 Correct 60 ms 95352 KB Output is correct
13 Correct 91 ms 102392 KB Output is correct
14 Correct 99 ms 102904 KB Output is correct
15 Correct 98 ms 102420 KB Output is correct
16 Correct 102 ms 102776 KB Output is correct
17 Correct 108 ms 103032 KB Output is correct
18 Correct 96 ms 102264 KB Output is correct
19 Correct 105 ms 102904 KB Output is correct
20 Correct 92 ms 102300 KB Output is correct
21 Correct 90 ms 102008 KB Output is correct
22 Correct 91 ms 102136 KB Output is correct
23 Correct 320 ms 155640 KB Output is correct
24 Correct 318 ms 154360 KB Output is correct
25 Execution timed out 2551 ms 428928 KB Time limit exceeded
26 Halted 0 ms 0 KB -