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Hi, I made a recursive Sudoku program, it’s working fine, but I’d like to add a solution counter, I’ve tried numerous code changes that would make it possible, but it didn’t work, finally I tried a solution using global variables as I would implement in C as a last resort, and also didn’t work, but I don’t know if I used this variable correctly, the python code returned me the following error:
File "~/CCR/UserFiles/Marcilio/Sudoku/sudoku.py", line 176, in Sudoku
contador += 1
UnboundLocalError: local variable 'contador' referenced before assignment
follows the code, with the global variable, or if there is another way to solve and can suggest me thank you:
contador = 0
def Sudoku(Mat, lin, col):
lin, col = ProcuraCasas(Mat)
if lin == -1 and col == -1:
if TestaMatrizPreenchida(Mat):
contador += 1
ImprimaMatriz(Mat)
print("\t")
else: print("Preenchimento incorreto")
else:
for candidato in range (1, 10):
if VerificaCandidato (Mat, lin, col, candidato) is True:
Mat[lin][col] = candidato
Sudoku(Mat, lin, col)
Mat[lin][col] = 0