Submission #1037929

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037929		fv3	Soccer Stadium (IOI23_soccer)	C++17	12 / 100	4588 ms	16328 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];
        }
    }

    vector<pair<int, int>> vpi;
    for (int y = 0; y < N; y++)
    {
        for (int x = 0; x < N; x++)
        {
            if (!F[y][x])
                vpi.push_back({x, y});
        }
    }

    for (int i = 0; i < vpi.size(); i++)
    {
        int x, y;
        tie(x, y) = vpi[i];

        for (int j = i+1; j < vpi.size(); j++)
        {
            int nx, ny;
            tie(nx, ny) = vpi[j];


            bool b1 = getvrange(y, ny, 1, 0, nt - 1, x) || gethrange(x, nx, 1, 0, nt - 1, ny);
            bool b2 = getvrange(y, ny, 1, 0, nt - 1, nx) || gethrange(x, nx, 1, 0, nt - 1, y);

            cerr << x << " " << y << " : " << nx << " " << ny << " = " << b1 << ", " << b2 << "\n";

            if (b1 && b2)
                return -1;
        }
    }

    return vpi.size();
}

Compilation message (stderr)

soccer.cpp: In function 'int biggest_stadium(int, std::vector<std::vector<int> >)':
soccer.cpp:61:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     for (int i = 0; i < vpi.size(); i++)
      |                     ~~^~~~~~~~~~~~
soccer.cpp:66:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |         for (int j = i+1; j < vpi.size(); j++)
      |                           ~~^~~~~~~~~~~~
soccer.cpp:30:9: warning: unused variable 'res' [-Wunused-variable]
   30 |     int res = 0;
      |         ^~~

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