Submission #1049606

#	Time	Username	Problem	Language	Result	Execution time	Memory
1049606		vjudge1	T-Covering (eJOI19_covering)	C++17	100 / 100	70 ms	16588 KiB

covering

#include<bits/stdc++.h>

using namespace std;

const int N = 1e6 + 2;

vector<vector<int>> a;
vector<int> xet;
vector<vector<bool>> check, dem, red;
int n, m, q, x[N], y[N];
int ans = 0, tmp = 0, tmp1 = 0;
int xx[] = {-1, -2, -1, 0, 1, 2, 1, 0, -1, 0, 1, 0}, yy[] = {-1, 0, 1, 2, 1, 0, -1, -2, 0, 1, 0, -1};

bool in(int u, int v)
{
    if(u < 0 || v < 0 || u >= n || v >= m)
        return false;
    return true;
}

void dfs(int u, int v)
{
    tmp += a[u][v];
    tmp1++;
    check[u][v] = true;
    for(int i = 8; i < 12; i++)
    {
        if(in(u + xx[i], v + yy[i]) && !dem[u + xx[i]][v + yy[i]] && !red[u + xx[i]][v + yy[i]])
        {
            dem[u + xx[i]][v + yy[i]] = true;
            xet.push_back(a[u + xx[i]][v + yy[i]]);
        }
    }
    for(int i = 0; i < 12; i++)
    {
        if(in(u + xx[i], v + yy[i]) && !check[u + xx[i]][v + yy[i]] && red[u + xx[i]][v + yy[i]])
            dfs(u + xx[i], v + yy[i]);
    }
}

int main ()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    cin >> n >> m;
    a.resize(n + 2);
    check.resize(n + 2);
    dem.resize(n + 2);
    red.resize(n + 2);
    for(int i = 0; i < n; i++)
    {
        a[i].resize(m + 2);
        check[i].resize(m + 2);
        dem[i].resize(m + 2);
        red[i].resize(m + 2);
        for(int j = 0; j < m; j++)
        {
            cin >> a[i][j];
            check[i][j] = dem[i][j] = red[i][j] = false;
        }
    }
    cin >> q;
    for(int i = 1; i <= q; i++)
    {
        cin >> x[i] >> y[i];
        if(red[x[i]][y[i]])
        {
            cout << "No";
            return 0;
        }
        red[x[i]][y[i]] = true;
    }
    for(int i = 1; i <= q; i++)
    {
        if(!check[x[i]][y[i]])
        {
            tmp = tmp1 = 0;
            dfs(x[i], y[i]);
            if(xet.size() < 3 * tmp1)
            {
                cout << "No";
                return 0;
            }
            ans += tmp;
            sort(xet.begin(), xet.end(), greater<int>());
            for(int j = 0; j < 3 * tmp1; j++)
                ans += xet[j];
            xet.clear();
        }
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

covering.cpp: In function 'int main()':
covering.cpp:79:27: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   79 |             if(xet.size() < 3 * tmp1)
      |                ~~~~~~~~~~~^~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 15 / 15
• Subtask 6: 20 / 20
• Subtask 7: 30 / 30