Compilare: user.cpp: In function ‘bool in_bounds(Point)’: user.cpp:41:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return 0 <= p.x && p.x < n && 0 <= p.y && p.y < m; ^ user.cpp:41:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return 0 <= p.x && p.x < n && 0 <= p.y && p.y < m; ^ user.cpp: In function ‘std::vector<std::vector<unsigned int> > process_dragons(std::vector<Point>)’: user.cpp:65:80: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(!visited[next_cell.x][next_cell.y] && map[next_cell.x][next_cell.y] != -1) { ^ user.cpp: In function ‘int main()’: user.cpp:135:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n; ++i) { ^ user.cpp:136:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < m; ++j) { ^