oj.uz

Submission #1080932

# Submission time Handle Problem Language Result Execution time Memory
1080932 2024-08-29T16:05:49 Z abouton Tiles (BOI24_tiles) C++17
0 / 100
 60 ms 8720 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long

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 && (x%2) == prec.par)
    {
        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 && (x%2) == suiv.par)
    {
        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.y2 < y2)
    {
        nb[(x+1)%2] ++;
        cout << maxi;
        exit(0);
    }
    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)]++;
    }
}

signed 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({1000000001, 1000000001, 0});
    for (int i = 0; i < nbA; i ++)
    {
        if (nb[(aretes[i].x+1)%2]==0)
            maxi = aretes[i].x;
        else if (nb[(aretes[i].x)%2]==0)
            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)
            {
                break;
            }
        }
    }
    if (nb[(aretes[nbA-1].x+1)%2]==0)
        maxi = aretes[nbA-1].x;
    else if (nb[(aretes[nbA-1].x)%2]==0)
        maxi = aretes[nbA-1].x-1;
    cout << maxi << '\n';
}

Subtask #1
0 / 4.0

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

Subtask #2
0 / 9.0

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

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Incorrect 8 ms 2264 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

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

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 23 ms 4056 KB Output is correct
3 Correct 22 ms 3964 KB Output is correct
4 Correct 27 ms 5840 KB Output is correct
5 Correct 38 ms 5840 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 39 ms 7252 KB Output is correct
9 Correct 49 ms 7380 KB Output is correct
10 Correct 53 ms 7368 KB Output is correct
11 Correct 51 ms 7352 KB Output is correct
12 Correct 57 ms 8136 KB Output is correct
13 Correct 60 ms 8720 KB Output is correct
14 Correct 44 ms 7364 KB Output is correct
15 Incorrect 40 ms 7364 KB Output isn't correct
16 Halted 0 ms 0 KB -

Subtask #6
0 / 25.0

# Verdict Execution time Memory Grader output
1 Incorrect 42 ms 7360 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

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