oj.uz

Submission #1080668

# Submission time Handle Problem Language Result Execution time Memory
1080668 2024-08-29T12:14:13 Z abouton Tiles (BOI24_tiles) C++17
25 / 100
 72 ms 8456 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 348 KB Output is correct
2 Incorrect 1 ms 348 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 348 KB Output is correct
2 Incorrect 1 ms 348 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 1760 KB Output is correct
3 Correct 72 ms 5764 KB Output is correct
4 Correct 23 ms 3284 KB Output is correct
5 Correct 22 ms 3288 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 45 ms 5772 KB Output is correct
9 Correct 26 ms 3584 KB Output is correct
10 Correct 47 ms 5884 KB Output is correct
11 Incorrect 25 ms 3024 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 456 KB Output is correct
3 Correct 0 ms 604 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 31 ms 3588 KB Output is correct
6 Correct 38 ms 3544 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 2 ms 764 KB Output is correct
11 Correct 1 ms 612 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Incorrect 0 ms 348 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 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 47 ms 5704 KB Output is correct
2 Correct 27 ms 3180 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 42 ms 6016 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 64 ms 5952 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 51 ms 6856 KB Output is correct
9 Correct 56 ms 5976 KB Output is correct
10 Correct 37 ms 5836 KB Output is correct
11 Correct 34 ms 6028 KB Output is correct
12 Correct 40 ms 5828 KB Output is correct
13 Correct 50 ms 5840 KB Output is correct
14 Correct 59 ms 5660 KB Output is correct
15 Correct 50 ms 5840 KB Output is correct
16 Correct 58 ms 8456 KB Output is correct
17 Correct 57 ms 8392 KB Output is correct
18 Correct 64 ms 8392 KB Output is correct
19 Correct 20 ms 3192 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 40 ms 5884 KB Output is correct
22 Correct 23 ms 3520 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 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 348 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 1 ms 460 KB Output is correct
34 Correct 1 ms 348 KB Output is correct
35 Correct 0 ms 348 KB Output is correct
36 Correct 21 ms 3288 KB Output is correct
37 Correct 30 ms 3760 KB Output is correct
38 Correct 30 ms 3796 KB Output is correct
39 Correct 43 ms 3680 KB Output is correct
40 Correct 32 ms 3796 KB Output is correct
41 Correct 0 ms 348 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 0 ms 460 KB Output is correct
44 Correct 0 ms 348 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 348 KB Output is correct
2 Incorrect 1 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -