oj.uz

Submission #576321

# Submission time Handle Problem Language Result Execution time Memory
576321 2022-06-13T02:49:57 Z timmyfeng Paint (COI20_paint) C++17
31 / 100
 3000 ms 183740 KB 
#include <bits/stdc++.h>
using namespace std;

const int DELTA_I[] = {0, 1, 0, -1}, DELTA_J[] = {-1, 0, 1, 0};

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

	int n, m; cin >> n >> m;

	vector<int> color(n * m);
	for (auto &i : color) cin >> i;

	vector<unordered_map<int, unordered_set<int>>> neighbors(n * m);
	vector<vector<int>> members(n * m);
	vector<int> leader(n * m);

	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < m; ++j) {
			int id = i * m + j;
			leader[id] = id;
			members[id].push_back(id);
			for (int dir = 0; dir < 4; ++dir) {
				int i_new = i + DELTA_I[dir], j_new = j + DELTA_J[dir];
				if (0 <= i_new && i_new < n && 0 <= j_new && j_new < m) {
					neighbors[id][color[i_new * m + j_new]].insert(i_new * m + j_new);
				}
			}
		}
	}

	auto update = [&](int a, bool add) {
		for (auto &[c, c_neighbors] : neighbors[a]) {
			for (auto b : c_neighbors) {
				if (add) neighbors[b][color[a]].insert(a);
				else neighbors[b][color[a]].erase(a);
			}
		}
	};

	auto merge = [&](int a, int b) {
		if (members[a].size() < members[b].size()) swap(a, b);

		for (auto i : members[b]) leader[i] = a;

		members[a].insert(members[a].end(), members[b].begin(), members[b].end());
		members[b].clear();

		for (auto &[c, c_neighbors] : neighbors[b])
			neighbors[a][c].insert(c_neighbors.begin(), c_neighbors.end());
		neighbors[b].clear();
	};

	auto fill = [&](int a, int c) {
		a = leader[a];
		update(a, false);
		while (!neighbors[a][c].empty()) {
			int b = *neighbors[a][c].begin();
			neighbors[a][c].erase(b);
			if (leader[b] != a) {
				update(b, false);
				merge(a, b);
				a = leader[a];
			}
		}
		color[a] = c;
		neighbors[a].erase(c);
		update(a, true);
	};

	for (int i = 0; i < n * m; ++i)
		fill(i, color[i]);

	int q; cin >> q;

	while (q--) {
		int i, j, c; cin >> i >> j >> c; --i, --j;
		fill(i * m + j, c);
	}

	for (int i = 0; i < n; ++i) {
		for (int j = 0; j < m; ++j) {
			cout << color[leader[i * m + j]] << " ";
		}
		cout << "\n";
	}
}

Subtask #1
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 980 KB Output is correct
2 Correct 4 ms 1492 KB Output is correct
3 Correct 47 ms 14420 KB Output is correct
4 Correct 53 ms 9420 KB Output is correct
5 Execution timed out 3064 ms 9172 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #2
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 320 ms 38044 KB Output is correct
2 Correct 462 ms 62044 KB Output is correct
3 Execution timed out 3076 ms 117020 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #3
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 667 ms 110604 KB Output is correct
2 Correct 610 ms 110156 KB Output is correct
3 Correct 648 ms 109752 KB Output is correct
4 Correct 709 ms 107824 KB Output is correct
5 Correct 670 ms 102756 KB Output is correct

Subtask #4
0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 1255 ms 147008 KB Output is correct
2 Execution timed out 3087 ms 183740 KB Time limit exceeded
3 Halted 0 ms 0 KB -