Submission #439214

#	Time	Username	Problem	Language	Result	Execution time	Memory
439214		elazarkoren	T-Covering (eJOI19_covering)	C++17	25 / 100	255 ms	4364 KiB

covering

#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#define x first
#define y second
#define chkmin(a, b) a = min(a, b)
#define chkmax(a, b) a = max(a, b)
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;
typedef vector<pii> vii;
typedef vector<bool> vb;
typedef vector<vb> vvb;

const int infinity = 1e9;

int main() {
    int n, m;
    cin >> n >> m;
    vvi board(n, vi(m));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> board[i][j];
        }
    }
    int k;
    cin >> k;
    vii special(k);
    vvb visited(n, vb(m));
    for (int i = 0; i < k; i++) {
        cin >> special[i].x >> special[i].y;
        visited[special[i].x][special[i].y] = true;
    }
    int ans = 0;
    vb finished(k);
    set<pii> touch;
    for (int i = 0; i < k; i++) {
        int x = special[i].x, y = special[i].y;
        int sum = board[x][y], min_val = infinity, bad = 4;
        if (x && !visited[x - 1][y]) {
            sum += board[x - 1][y];
            bad--;
            chkmin(min_val, board[x - 1][y]);
        }
        if (x < n - 1 && !visited[x + 1][y]) {
            sum += board[x + 1][y];
            bad--;
            chkmin(min_val, board[x + 1][y]);
        }
        if (y && !visited[x][y - 1]) {
            sum += board[x][y - 1];
            bad--;
            chkmin(min_val, board[x][y - 1]);
        }
        if (y < m - 1 && !visited[x][y + 1]) {
            sum += board[x][y + 1];
            bad--;
            chkmin(min_val, board[x][y + 1]);
        }
        if (bad == 1) {
            finished[i] = true;
            ans += sum;
        } else if (bad > 1) {
            cout << "No";
            return 0;
        } else {
            if (!visited[x - 1][y - 1] && !visited[x - 1][y + 1] && !visited[x + 1][y - 1] && !visited[x + 1][y + 1]) {
                ans += sum - min_val;
                finished[i] = true;
            } else {
                touch.insert({x, y}), touch.insert({x - 1, y}), touch.insert({x + 1, y}), touch.insert({x, y + 1}), touch.insert({x, y - 1});
            }
        }
    }
    for (pii p : touch) {
        ans += board[p.x][p.y];
    }
    cout << ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 15
• Subtask 6: 0 / 20
• Subtask 7: 0 / 30