Submission #290729

#	Time	Username	Problem	Language	Result	Execution time	Memory
290729		IgorI	Rectangles (IOI19_rect)	C++17	72 / 100	5154 ms	1044032 KiB

rect

#include <bits/stdc++.h>

using namespace std;

const int INF = 88888888;
const int N = 2512;

typedef vector<vector<int> > vvi;
typedef vector<int> vi;

#define all(x) (x).begin(), (x).end()

int le[N][N], ri[N][N], up[N][N], down[N][N];
vector<pair<int, int> > rooted[N][N];

struct query{
    int l, r;
    int x, tm;
};

long long count_rectangles(vector<vector<int> > a)
{
    int n = a.size(), m = a[0].size();
    for (int i = 0; i < n; i++)
    {
        vector<pair<int, int> > st;
        st.push_back({-1, INF});
        for (int j = 0; j < m; j++)
        {
            while (st.back().second < a[i][j]) st.pop_back();
            le[i][j] = st.back().first;
            st.push_back({j, a[i][j]});
        }
    }
    for (int i = 0; i < n; i++)
    {
        vector<pair<int, int> > st;
        st.push_back({m, INF});
        for (int j = m - 1; j >= 0; j--)
        {
            while (st.back().second < a[i][j]) st.pop_back();
            ri[i][j] = st.back().first;
            st.push_back({j, a[i][j]});
        }
    }
    for (int j = 0; j < m; j++)
    {
        vector<pair<int, int> > st;
        st.push_back({-1, INF});
        for (int i = 0; i < n; i++)
        {
            while (st.back().second < a[i][j]) st.pop_back();
            up[i][j] = st.back().first;
            st.push_back({i, a[i][j]});
        }
    }
    for (int j = 0; j < m; j++)
    {
        vector<pair<int, int> > st;
        st.push_back({n, INF});
        for (int i = n - 1; i >= 0; i--)
        {
            while (st.back().second < a[i][j]) st.pop_back();
            down[i][j] = st.back().first;
            st.push_back({i, a[i][j]});
        }
    }
    for (int i = 1; i + 1 < n; i++)
    {
        for (int j = 1; j + 1 < m; j++)
        {
            {
                int r = ri[i][j - 1] - 1;
                int u0 = up[i + 1][j] + 1;
                int u1 = up[i + 1][r] + 1;
                int d0 = down[i - 1][j] - 1;
                int d1 = down[i - 1][r] - 1;
                rooted[u0][j].push_back({i, r});
                rooted[u1][j].push_back({i, r});
                rooted[i][j].push_back({d0, r});
                rooted[i][j].push_back({d1, r});
            }
            {
                int l = le[i][j + 1] + 1;
                int u0 = up[i + 1][l] + 1;
                int u1 = up[i + 1][j] + 1;
                int d0 = down[i - 1][l] - 1;
                int d1 = down[i - 1][j] - 1;
                rooted[u0][l].push_back({i, j});
                rooted[u1][l].push_back({i, j});
                rooted[i][l].push_back({d0, j});
                rooted[i][l].push_back({d1, j});
            }
        }
    }
    int ans = 0;
    vector<int> res;
    vector<vector<query> > qd(n);
    vector<vector<query> > qu(n);
    vector<vector<query> > qr(m);
    vector<vector<query> > ql(m);
    for (int i = 1; i < n; i++)
    {
        for (int j = 1; j < m; j++)
        {
            sort(all(rooted[i][j]));
            rooted[i][j].resize(unique(all(rooted[i][j])) - rooted[i][j].begin());
            for (auto p : rooted[i][j])
            {
                int i2 = p.first, j2 = p.second;
                if (i <= i2 && j <= j2 && i2 < n - 1 && j2 < m - 1)
                {
                    int t = 1;
                    for (int y = j; y <= j2; y++)
                        if (down[i - 1][y] <= i2) t = 0;
                    for (int y = j; y <= j2; y++)
                        if (up[i2 + 1][y] >= i) t = 0;
                    for (int x = i; x <= i2; x++)
                        if (ri[x][j - 1] <= j2) t = 0;
                    for (int x = i; x <= i2; x++)
                        if (le[x][j2 + 1] >= j) t = 0;
                    ans += t;
                    qd[i - 1].push_back({j, j2, i2 + 1, res.size()});
                    qu[i2 + 1].push_back({j, j2, i - 1, res.size()});
                    qr[j - 1].push_back({i, i2, j2 + 1, res.size()});
                    ql[j2 + 1].push_back({i, i2, j - 1, res.size()});
                    res.push_back(1);
                }
            }
            rooted[i][j].clear();
        }
    }
    return ans;
}

Compilation message (stderr)

rect.cpp: In function 'long long int count_rectangles(std::vector<std::vector<int> >)':
rect.cpp:123:65: warning: narrowing conversion of 'res.std::vector<int>::size()' from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing]
  123 |                     qd[i - 1].push_back({j, j2, i2 + 1, res.size()});
      |                                                         ~~~~~~~~^~
rect.cpp:124:65: warning: narrowing conversion of 'res.std::vector<int>::size()' from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing]
  124 |                     qu[i2 + 1].push_back({j, j2, i - 1, res.size()});
      |                                                         ~~~~~~~~^~
rect.cpp:125:65: warning: narrowing conversion of 'res.std::vector<int>::size()' from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing]
  125 |                     qr[j - 1].push_back({i, i2, j2 + 1, res.size()});
      |                                                         ~~~~~~~~^~
rect.cpp:126:65: warning: narrowing conversion of 'res.std::vector<int>::size()' from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing]
  126 |                     ql[j2 + 1].push_back({i, i2, j - 1, res.size()});
      |                                                         ~~~~~~~~^~

• Subtask 1: 8 / 8
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 22 / 22
• Subtask 5: 10 / 10
• Subtask 6: 13 / 13
• Subtask 7: 0 / 28