Compilare: user.cpp: In function ‘int main()’: user.cpp:42:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&m); ^ user.cpp:44:36: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(mat[i] + 1, m + 10, fi); ^ user.cpp:57:19: warning: ‘cj’ may be used uninitialized in this function [-Wmaybe-uninitialized] bfs(lj, cj, 0); ^ user.cpp:57:19: warning: ‘lj’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:56:19: warning: ‘cr’ may be used uninitialized in this function [-Wmaybe-uninitialized] bfs(lr, cr, 1); ^ user.cpp:56:19: warning: ‘lr’ may be used uninitialized in this function [-Wmaybe-uninitialized]