oj.uz

Submission #1080681

# Submission time Handle Problem Language Result Execution time Memory
1080681 2024-08-29T12:36:17 Z abouton Tiles (BOI24_tiles) C++17
25 / 100
 62 ms 8396 KB 
#include <bits/stdc++.h>
using namespace std;

struct ar
{
    int yD, yF, x;
    bool typ;
    bool operator<(const ar &autre) const
    {
        if (x == autre.x) return yD < autre.yD;
        return x < autre.x;
    }
};

struct inter
{
    int y1, y2;
    bool par;
    bool operator<(const inter &autre) const
    {
        return y1 < autre.y1;
    }
};
int nbI;
vector<ar> aretes;
set<inter> cur;
int N, M, maxi;
int nbA;
int nb[2];

void aj(int y1, int y2, int x)
{
    auto it = cur.lower_bound({y2,0,0});
    assert (it != cur.begin());
    assert(it != cur.end());
    auto prec = *prev(it);
    auto suiv = *it;
    if (y1 == prec.y2)
    {
        y1 = prec.y1;
        nb[prec.par]--;
        nbI -= ((prec.y1+prec.y2)%2);
        cur.erase(prec);
        if ((prec.par+x)%2) nb[(x+1)%2]++;
    }
    if (y2==suiv.y1)
    {
        y2 = suiv.y2;
        nb[suiv.par]--;
        nbI -= ((suiv.y1+suiv.y2)%2);
        cur.erase(suiv);
        if ((suiv.par+x)%2) nb[(x+1)%2]++;
    }
    nb[(bool)(x%2)]++;
    cur.insert({y1,y2,(bool)(x%2)});
    nbI += ((y1+y2)%2);
}

void ret(int y1,int y2, int x)
{
    auto it = cur.upper_bound({y1,0,0});
    auto mec = *prev(it);
    //cout << y1 << ' ' << y2 << ' ' << mec.y1 << ' ' << mec.y2 << '\n';
    //cout << (*it).y1 << ' ' << (*it).y2 << '\n';
    assert (mec.y1 <= y1 && mec.y2 >= y2);
    //cout << "alors " << y1 << ' ' << y2 << ' ' << mec.y1 << ' ' << mec.y2 << '\n';
    if ((mec.par+x)%2) nb[(x+1)%2] ++;
    nb[mec.par]--;
    nbI -= ((mec.y1+mec.y2)%2);
    cur.erase(mec);

    if (y1 > mec.y1)
    {

        nbI += ((mec.y1+y1)%2);
        //cout << mec.y1 << ' ' <<y1<<'\n';
        cur.insert({mec.y1, y1, (bool)(x%2)});
        //cout << 'a';
        //for (auto i : cur) cout << i.y1 <<i.y2<<' ';
        nb[(bool)(x%2)]++;
    }
    if (y2 < mec.y2)
    {        
        nbI += ((mec.y2+y2)%2);
        cur.insert({y2, mec.y2, (bool)(x%2)});
        nb[(bool)(x%2)]++;
    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin >> N >> M;
    maxi = 0;
    bool sens = 0;
    int precX, precY, x0, y0;
    cin >> precX >> precY;
    x0 = precX; y0 = precY;
    for (int i = 0; i < N; i ++)
    {
        int x, y;
        if (i<N-1) cin >> x >> y;
        else
        {
            x = x0; y = y0;
        }
        if (x == precX)
        {
            aretes.push_back({precY, y, x, 0});
        }
        if (x == 0 && precX == 0) {sens = !(y>precY);}
        precX = x; precY = y;
    }
    nbA = aretes.size();
    for (int i = 0; i < nbA; i ++)
    {
        aretes[i].typ = sens ^ (aretes[i].yF > aretes[i].yD);
        //cout << (int) sens << (int)(aretes[i].yF>aretes[i].yD);
        if (aretes[i].yF < aretes[i].yD) swap(aretes[i].yD, aretes[i].yF);
    }

    //for (auto i : aretes)
    //{
    //    cout << i.yD << ' ' << i.yF << ' ' << i.x << ' ' << (int)i.typ << '\n';
    //}

    sort(aretes.begin(), aretes.end());
    cur.insert({-1, -1,0});
    cur.insert({1000000000, 1000000000, 0});
    for (int i = 0; i < nbA; i ++)
    {
        if (nb[(aretes[i].x+1)%2]==0)
            maxi = aretes[i].x;
        else
            maxi = aretes[i].x-1;
            
        if (aretes[i].typ) aj(aretes[i].yD, aretes[i].yF, aretes[i].x);
        else ret(aretes[i].yD, aretes[i].yF, aretes[i].x);

        /*cout << "nouv : " << aretes[i].yD << ' ' << aretes[i].yF << ' ' << aretes[i].x << '\n';
        for (auto truc : cur)
        {
            cout << truc.y1 << ' ' << truc.y2 << " et " << nbI << '\n';
        }
        cout << '\n';*/

        if (i == nbA-1 || aretes[i+1].x > aretes[i].x)
        {
            //cout << nb[0] << ' ' << nb[1] << '\n';
            if (nbI!=0 || nb[(aretes[i].x+1)%2]!=0)
            {
                cout << maxi << '\n';
                return 0;
            }
        }
    }
    cout << maxi << '\n';
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 344 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 344 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 7 ms 1624 KB Output is correct
3 Correct 39 ms 5832 KB Output is correct
4 Correct 20 ms 3284 KB Output is correct
5 Correct 21 ms 3288 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 42 ms 5956 KB Output is correct
9 Correct 24 ms 3536 KB Output is correct
10 Correct 37 ms 5836 KB Output is correct
11 Incorrect 19 ms 2780 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 27 ms 3796 KB Output is correct
6 Correct 37 ms 3544 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 2 ms 604 KB Output is correct
11 Correct 0 ms 452 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Incorrect 0 ms 604 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 5836 KB Output is correct
2 Correct 22 ms 3128 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 41 ms 5832 KB Output is correct
5 Correct 1 ms 600 KB Output is correct
6 Correct 44 ms 5908 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 51 ms 6820 KB Output is correct
9 Correct 62 ms 5952 KB Output is correct
10 Correct 38 ms 5832 KB Output is correct
11 Correct 34 ms 5844 KB Output is correct
12 Correct 37 ms 5744 KB Output is correct
13 Correct 47 ms 5580 KB Output is correct
14 Correct 53 ms 5832 KB Output is correct
15 Correct 47 ms 5908 KB Output is correct
16 Correct 55 ms 8396 KB Output is correct
17 Correct 50 ms 8388 KB Output is correct
18 Correct 52 ms 8392 KB Output is correct
19 Correct 22 ms 3280 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 42 ms 5984 KB Output is correct
22 Correct 23 ms 3592 KB Output is correct
23 Correct 1 ms 344 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 456 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 0 ms 348 KB Output is correct
36 Correct 20 ms 3092 KB Output is correct
37 Correct 31 ms 3800 KB Output is correct
38 Correct 29 ms 3544 KB Output is correct
39 Correct 33 ms 3800 KB Output is correct
40 Correct 35 ms 3544 KB Output is correct
41 Correct 1 ms 344 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 0 ms 344 KB Output is correct
44 Correct 0 ms 344 KB Output is correct
45 Correct 0 ms 348 KB Output is correct
46 Correct 1 ms 348 KB Output is correct

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Incorrect 0 ms 344 KB Output isn't correct
3 Halted 0 ms 0 KB -