Submission #1133854

#	Time	Username	Problem	Language	Result	Execution time	Memory
1133854		sidripper	Tracks in the Snow (BOI13_tracks)	C++20	Compilation error	0 ms	0 KiB

tracks

#include <bits/stdc++.h>

using namespace std;


void dfs(int row, int col, int H, int W, vector<vector<char>>& grid, set<pair<int, int>>* visited, int* rabbit, int* fox) {

	if (row < 0 || col < 0 || col >= W || row >= H ||  grid[row][col] == '.' || visited->find({row, col}) != visited->end()) {
		return;
	}

	visited->insert({row, col});
	if (grid[row][col] == 'R') {
		*rabbit = 1;
	}
	if (grid[row][col] == 'F') {
		*fox = 1;
	}
	dfs(row+1, col, H, W, grid, visited, rabbit, fox);
	dfs(row-1, col, H, W, grid, visited, rabbit, fox);
	dfs(row, col+1, H, W, grid, visited, rabbit, fox);
	dfs(row, col-1, H, W, grid, visited, rabbit, fox);

}

int main () {


	int H, W;
	cin >> H >> W;
	vector< vector<char> > grid(H, vector<char>(W));
	for (int i=0; i<H; i++) {
		for (int j=0; j<W; j++) {
			cin >> grid[i][j];
		}
	}

	set<pair<int, int>> visited;
	int ans = 0;
	for (int row=0; row<H; row++) {
		for (int col=0; col<W; col++) {

			if (grid[row][col] == '.' || visited.find({row, col}) != visited.end()) {
				continue;
			}
			int rabbit = 0;
			int fox = 0;
			dfs(row, col, H, W, &grid, &visited, &rabbit, &fox);
			ans += rabbit;
			ans += fox;
			

		}
	}
	cout << ans;
	

}

Compilation message (stderr)

tracks.cpp: In function 'int main()':
tracks.cpp:48:45: error: invalid initialization of non-const reference of type 'std::vector<std::vector<char> >&' from an rvalue of type 'std::vector<std::vector<char> >*'
   48 |                         dfs(row, col, H, W, &grid, &visited, &rabbit, &fox);
      |                                             ^~~~~
tracks.cpp:6:64: note: in passing argument 5 of 'void dfs(int, int, int, int, std::vector<std::vector<char> >&, std::set<std::pair<int, int> >*, int*, int*)'
    6 | void dfs(int row, int col, int H, int W, vector<vector<char>>& grid, set<pair<int, int>>* visited, int* rabbit, int* fox) {
      |                                          ~~~~~~~~~~~~~~~~~~~~~~^~~~