Submission #1054971

#	Time	Username	Problem	Language	Result	Execution time	Memory
1054971		voi	T-Covering (eJOI19_covering)	C++17	100 / 100	55 ms	11776 KiB

covering

#include <bits/stdc++.h>
#define all(s) s.begin(), s.end()
#define lb(s, a) lower_bound(all(s), (a)) - s.begin()
#define ii pair <int, int>
#define fi first
#define se second

using namespace std;

typedef long long ll;

const int ar = 2e5+5;
const ll mod = 1e9+7;
const int oo = 1e9;

int n, m, k;
int dx[] = {-1, 1, 0, 0};
int dy[] = {0, 0, -1, 1};

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define task "d"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    cin >> m >> n;
    vector <vector <int>> a(m + 1, vector <int> (n + 1, 0));
    vector <vector <bool>> ok(m + 1, vector <bool> (n + 1, 0));
    vector <vector <bool>> vs(m + 1, vector <bool> (n + 1, 0));
    for(int i = 1; i <= m; ++i)
        for(int j = 1; j <= n; ++j)
        cin >> a[i][j];
    cin >> k;
    int x, y;
    for(int i = 1; i <= k; ++i) {
        cin >> x >> y;
        x++;
        y++;
        ok[x][y] = 1;
    }

    int res = 0;
    for(int i = 1; i <= m; ++i)
    for(int j = 1; j <= n; ++j) if(!vs[i][j] && ok[i][j]) {
        vs[i][j] = 1;
        queue <ii> q;
        q.push({i, j});

        vector <int> val;
        int cnt = 0;
        while(q.size()) {
            int u = q.front().fi, v = q.front().se;
            q.pop();

            if(ok[u][v]) {
                cnt++, res += a[u][v];
//                cout << u << ' ' << v << '\n';
            }
            else val.push_back(a[u][v]);

            for(int t = 0; t < 4; ++t) {
                int x = u + dx[t], y = v + dy[t];
                if(x > 0 && y > 0 && x <= m && y <= n && !vs[x][y] && (ok[u][v] || ok[x][y]))
                    vs[x][y] = 1, q.push({x, y});
            }
        }
        if(val.size() < 3 * cnt) cout << "No", exit(0);

//        cout << i << ' ' << j << '\n';
        for(auto x : val)
            res += x;
        if(val.size() > 3 * cnt) res -= (*min_element(all(val)));
//        cout << '\n';
    }
    cout << res;
}

Compilation message (stderr)

covering.cpp: In function 'int main()':
covering.cpp:69:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   69 |         if(val.size() < 3 * cnt) cout << "No", exit(0);
      |            ~~~~~~~~~~~^~~~~~~~~
covering.cpp:74:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   74 |         if(val.size() > 3 * cnt) res -= (*min_element(all(val)));
      |            ~~~~~~~~~~~^~~~~~~~~
covering.cpp:25:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
covering.cpp:26:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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