#esercizio 1

def changeX(pic,x):
#param pic: Picture
#param x: Int
  assert x>=0 and x <=getWidth(pic)
  assert getWidth(pic)==getHeight(pic)
  for c in range(0,getWidth(pic)):
    colC=getColor(getPixel(pic,x,c))
    colR=getColor(getPixel(pic,c,x))
    setColor(getPixel(pic,c,x),colC)
    setColor(getPixel(pic,x,c),colR)

  repaint(pic)



#esercizio 2


def changeXInt(mat,x):
#param mat: List
#param x: Int
  assert x>=0 and x<=len(mat)
  assert checkMat(mat)
  for c in range(0,len(mat)):
    app=mat[x][c]
    mat[x][c]=mat[c][x]
    mat[c][x]=app




def checkMat(mat):
#param mat:List
#return: bool
  for i in range(0,len(mat)):
    if len(mat[i])!=len(mat):
      return False
  return True



#esercizio 3

def modifyPicture(pic,x,y,col):
#param pic: Picture
#param x:int
#param y:int
#param c:Color
  assert x<=getWidth(pic)-1 and y<=getHeight(pic)-1 and x>=0 and y>=0
  if getHeight(pic)-y<=getWidth(pic)-x:
    while y<getHeight(pic)-1:
      pix=getPixel(pic,x,y)
      setColor(pix,col )
      x=x+1
      y=y+1
      repaint(pic)
  else:
    while x< getWidth(pic)-1:
      pix=getPixel(pic,x,y)
      setColor(pix,col)
      x=x+1
      y=y+1
      repaint(pic)



#esercizio 4

def annulDiagonal(x,y,mat):
#param x: int
#param y: int
#param mat: List
  i=0
  assert x>=0 and y>=0 and x<=len(mat[i]) and y<=len(mat) and len(mat)>0
  if len(mat)-y<=len(mat[i])-x:
    while y+i<len(mat):
      mat[x+i][y+i]=0
      i+=1
  else:
    while x+i<len(mat[i]):
      mat[x+i][y+i]=0
      i+=1


#esercizio 5


def value(lista):
#param lista: List
#return: int
  newString=""
  cont=0
  assert len(lista)>0
  for i in range(0,len(lista)):
    if not str(lista[i]) in newString:
      newString=newString+str(lista[i])
      cont+=1
  return cont