Submission #1038009

#	Time	Username	Problem	Language	Result	Execution time	Memory
1038009		fv3	Soccer Stadium (IOI23_soccer)	C++17	16 / 100	239 ms	6452 KiB

soccer

#include "soccer.h"
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int nt = 1;
vector<vector<int>> st_h, st_v;

int getvrange(int l, int r, int k, int x, int y, int i)
{
    if (l > r) swap(l, r);
    if (r < x || l > y) return 0;
    if (x >= l && y <= r) return st_v[i][k];
    int c = (x + y) / 2;
    return getvrange(l, r, k*2, x, c, i) + getvrange(l, r, k*2|1, c+1, y, i);
}

int gethrange(int l, int r, int k, int x, int y, int i)
{
    if (l > r) swap(l, r);
    if (r < x || l > y) return 0;
    if (x >= l && y <= r) return st_h[i][k];
    int c = (x + y) / 2;
    return gethrange(l, r, k*2, x, c, i) + gethrange(l, r, k*2|1, c+1, y, i);
}

int biggest_stadium(int N, vector<vector<int>> F)
{
    int res = 0;

    while (nt < N)
        nt *= 2;

    st_v = st_h = vector<vector<int>>(N, vector<int>(2*nt));
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < N; j++)
        {
            st_h[i][nt + j] = F[i][j];
            st_v[i][nt + j] = F[j][i];
        }

        for (int j = nt - 1; j >= 1; j--)
        {
            st_h[i][j] = st_h[i][j*2] + st_h[i][j*2|1];
            st_v[i][j] = st_v[i][j*2] + st_v[i][j*2|1];
        }
    }

    int top;
    int topl, topr;
    for (int i = 0; i < N; i++)
    {
        if (st_h[i][1] == N) continue;
        for (int j = 0; j < N; j++)
        {
            if (F[i][j]) continue;
            if (gethrange(j, j + (N - st_h[i][1] - 1), 1, 0, nt - 1, i))
                return -1;

            top = i;
            topl = j;
            topr = j + (N - st_h[i][1] - 1);

            break;
        }
        break;
    }

    int btm;
    int btml, btmr;
    for (int i = N-1; i >= 0; i--)
    {
        if (st_h[i][1] == N) continue;
        for (int j = 0; j < N; j++)
        {
            if (F[i][j]) continue;
            if (gethrange(j, j + (N - st_h[i][1] - 1), 1, 0, nt - 1, i))
                return -1;

            btm = i;
            btml = j;
            btmr = j + (N - st_h[i][1] - 1);
            break;
        }
        break;
    }

    int lft;
    int lft_up, lft_dwn;
    for (int i = 0; i < N; i++)
    {
        if (st_v[i][1] == N) continue;
        for (int j = 0; j < N; j++)
        {
            if (F[j][i]) continue;
            if (getvrange(j, j + (N - st_v[i][1] - 1), 1, 0, nt - 1, i))
                return -1;

            lft = i;
            lft_up = j;
            lft_dwn = j + (N - st_v[i][1] - 1);
            break;
        }
        break;
    }

    int right;
    int right_up, right_dwn;
    for (int i = N-1; i >= 0; i--)
    {
        if (st_v[i][1] == N) continue;
        for (int j = 0; j < N; j++)
        {
            if (F[j][i]) continue;
            if (getvrange(j, j + (N - st_v[i][1] - 1), 1, 0, nt - 1, i))
                return -1;

            right = i;
            right_up = j;
            right_dwn = j + (N - st_v[i][1] - 1);
            break;
        }
        break;
    }

    if (!(lft_up >= right_up && lft_dwn <= right_dwn) && !(lft_up <= right_up && lft_dwn >= right_dwn))
        return -1;

    int v = max(max(lft_up, right_up), min(lft_dwn, right_dwn));
    if (!(topl >= btml && topr <= btmr) && !(topl <= btml && topr >= btmr))
        return -1;
    int h = max(max(topl, btml), min(topr, btmr));

    int cnt = 0;
    for (int x = 0; x < N; x++)
    {
        for (int y = 0; y < N; y++)
        {
            if (F[y][x]) 
                continue;
            cnt++;
        }
    }

    if (N <= 500)
    {
        for (int x = 0; x < N; x++)
        {
            for (int y = 0; y < N; y++)
            {
                if (F[y][x]) 
                    continue;

                {
                    bool b1 = getvrange(y, lft_up, 1, 0, nt - 1, x) || gethrange(x, lft, 1, 0, nt - 1, lft_up);
                    bool b2 = getvrange(y, lft_up, 1, 0, nt - 1, lft) || gethrange(x, lft, 1, 0, nt - 1, y);
                    if (b1 && b2)
                        return -1;    
                }

                {
                    bool b1 = getvrange(y, right_up, 1, 0, nt - 1, x) || gethrange(x, right, 1, 0, nt - 1, right_up);
                    bool b2 = getvrange(y, right_up, 1, 0, nt - 1, right) || gethrange(x, right, 1, 0, nt - 1, y);
          
                    if (b1 && b2)
                        return -1;    
                }
                
                {
                    bool b1 = getvrange(y, lft_dwn, 1, 0, nt - 1, x) || gethrange(x, lft, 1, 0, nt - 1, lft_dwn);
                    bool b2 = getvrange(y, lft_dwn, 1, 0, nt - 1, lft) || gethrange(x, lft, 1, 0, nt - 1, y);
          
                    if (b1 && b2)
                        return -1;    
                }

                {
                    bool b1 = getvrange(y, right_dwn, 1, 0, nt - 1, x) || gethrange(x, right, 1, 0, nt - 1, right_dwn);
                    bool b2 = getvrange(y, right_dwn, 1, 0, nt - 1, right) || gethrange(x, right, 1, 0, nt - 1, y);
          
                    if (b1 && b2)
                        return -1;    
                }
                {
                    bool b1 = getvrange(y, top, 1, 0, nt - 1, topl) || gethrange(x, topl, 1, 0, nt - 1, y);
                    bool b2 = getvrange(y, top, 1, 0, nt - 1, x) || gethrange(x, topl, 1, 0, nt - 1, top);
          
                    if (b1 && b2)
                        return -1;    
                }
                {
                    bool b1 = getvrange(y, top, 1, 0, nt - 1, topr) || gethrange(x, topr, 1, 0, nt - 1, y);
                    bool b2 = getvrange(y, top, 1, 0, nt - 1, x) || gethrange(x, topr, 1, 0, nt - 1, top);  
                    if (b1 && b2)
                        return -1;    
                }
                {
                    bool b1 = getvrange(y, btm, 1, 0, nt - 1, btml) || gethrange(x, btml, 1, 0, nt - 1, y);
                    bool b2 = getvrange(y, btm, 1, 0, nt - 1, x) || gethrange(x, btml, 1, 0, nt - 1, btm);
                    if (b1 && b2)
                        return -1;    
                }
                {
                    bool b1 = getvrange(y, btm, 1, 0, nt - 1, btmr) || gethrange(x, btmr, 1, 0, nt - 1, y);
                    bool b2 = getvrange(y, btm, 1, 0, nt - 1, x) || gethrange(x, btmr, 1, 0, nt - 1, btm);
                    if (b1 && b2)
                        return -1;    
                }
            }
        }
    }


    return cnt;
}

Compilation message (stderr)

soccer.cpp: In function 'int biggest_stadium(int, std::vector<std::vector<int> >)':
soccer.cpp:30:9: warning: unused variable 'res' [-Wunused-variable]
   30 |     int res = 0;
      |         ^~~
soccer.cpp:131:9: warning: unused variable 'v' [-Wunused-variable]
  131 |     int v = max(max(lft_up, right_up), min(lft_dwn, right_dwn));
      |         ^
soccer.cpp:134:9: warning: unused variable 'h' [-Wunused-variable]
  134 |     int h = max(max(topl, btml), min(topr, btmr));
      |         ^
soccer.cpp:173:40: warning: 'lft_dwn' may be used uninitialized in this function [-Wmaybe-uninitialized]
  173 |                     bool b2 = getvrange(y, lft_dwn, 1, 0, nt - 1, lft) || gethrange(x, lft, 1, 0, nt - 1, y);
      |                               ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:128:55: warning: 'lft_up' may be used uninitialized in this function [-Wmaybe-uninitialized]
  128 |     if (!(lft_up >= right_up && lft_dwn <= right_dwn) && !(lft_up <= right_up && lft_dwn >= right_dwn))
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:206:81: warning: 'btmr' may be used uninitialized in this function [-Wmaybe-uninitialized]
  206 |                     bool b1 = getvrange(y, btm, 1, 0, nt - 1, btmr) || gethrange(x, btmr, 1, 0, nt - 1, y);
      |                                                                        ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:132:41: warning: 'btml' may be used uninitialized in this function [-Wmaybe-uninitialized]
  132 |     if (!(topl >= btml && topr <= btmr) && !(topl <= btml && topr >= btmr))
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:194:81: warning: 'topr' may be used uninitialized in this function [-Wmaybe-uninitialized]
  194 |                     bool b1 = getvrange(y, top, 1, 0, nt - 1, topr) || gethrange(x, topr, 1, 0, nt - 1, y);
      |                                                                        ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:132:41: warning: 'topl' may be used uninitialized in this function [-Wmaybe-uninitialized]
  132 |     if (!(topl >= btml && topr <= btmr) && !(topl <= btml && topr >= btmr))
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:158:83: warning: 'lft' may be used uninitialized in this function [-Wmaybe-uninitialized]
  158 |                     bool b2 = getvrange(y, lft_up, 1, 0, nt - 1, lft) || gethrange(x, lft, 1, 0, nt - 1, y);
      |                                                                          ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:207:78: warning: 'btm' may be used uninitialized in this function [-Wmaybe-uninitialized]
  207 |                     bool b2 = getvrange(y, btm, 1, 0, nt - 1, x) || gethrange(x, btmr, 1, 0, nt - 1, btm);
      |                                                                     ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:195:78: warning: 'top' may be used uninitialized in this function [-Wmaybe-uninitialized]
  195 |                     bool b2 = getvrange(y, top, 1, 0, nt - 1, x) || gethrange(x, topr, 1, 0, nt - 1, top);
      |                                                                     ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:181:40: warning: 'right_dwn' may be used uninitialized in this function [-Wmaybe-uninitialized]
  181 |                     bool b2 = getvrange(y, right_dwn, 1, 0, nt - 1, right) || gethrange(x, right, 1, 0, nt - 1, y);
      |                               ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:128:55: warning: 'right_up' may be used uninitialized in this function [-Wmaybe-uninitialized]
  128 |     if (!(lft_up >= right_up && lft_dwn <= right_dwn) && !(lft_up <= right_up && lft_dwn >= right_dwn))
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
soccer.cpp:165:87: warning: 'right' may be used uninitialized in this function [-Wmaybe-uninitialized]
  165 |                     bool b2 = getvrange(y, right_up, 1, 0, nt - 1, right) || gethrange(x, right, 1, 0, nt - 1, y);
      |                                                                              ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 6
• Subtask 2: 2 / 8
• Subtask 3: 5.5 / 22
• Subtask 4: 4.5 / 18
• Subtask 5: 4 / 16
• Subtask 6: 0 / 30