Compilare: user.cpp: In function ‘void _findPath(char**, int&, int&, Point, Point&, int&, Point*, std::queue<Point*>&)’: user.cpp:44:149: warning: operation on ‘step’ may be undefined [-Wsequence-point] pathTemp[step++].set(start.x, start.y, step > 0 ? pathTemp[step-1].i + start.x : start.x, step > 0 ? pathTemp[step-1].j + start.y : start.y); ^ user.cpp:44:149: warning: operation on ‘step’ may be undefined [-Wsequence-point] user.cpp:46:68: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (start.x == end.x && start.y == end.y && (path.size() > step || path.empty() || (path.size() == step && path.back()->i > pathTemp[step-1].i) || ^ user.cpp:46:108: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (start.x == end.x && start.y == end.y && (path.size() > step || path.empty() || (path.size() == step && path.back()->i > pathTemp[step-1].i) || ^ user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] (path.size() == step && path.back()->i == pathTemp[step-1].i && path.back()->j > pathTemp[step-1].j))) ^ user.cpp: In function ‘void findPath(char**, int, int)’: user.cpp:72:21: warning: unused variable ‘x’ [-Wunused-variable] int i, j, tmin, x, y; ^ user.cpp:72:24: warning: unused variable ‘y’ [-Wunused-variable] int i, j, tmin, x, y; ^ user.cpp: In function ‘char** read(int*, int*)’: user.cpp:22:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%i%i", n, m); ^