sudoku row and column check

[asuri]

Hey all,
I was trying to make a sudoku solver for a 4 by 4 one, it all seems to be ok except the function where i am trying to compare the numbers in each row and column so that the numbers don't have a repetition. I have written this code, and I cant seem to find an error although it is showing some logical error. Assume the user had input the sudoku question in the main.

bool check_rowcol(int mainboard[4][4])
{
bool a=true;
int count_row=0;
int count_col=0;

for(int i=1;i<=4;i++)
{
for(int j=0;j<4;j++)
{
for(int k=0;k<4;k++)
{
if(mainboard[j][k]==i) count_row++;
if(mainboard[k][j]==i) count_col++;
}
if(count_row>1||count_col>1) a=false;
count_row=0; count_col=0;
}

}
return a;
}

[PanGalactic]

You may find that it is easier to just check the row and column as each number is entered, rather than checking the validity of the entire board every time.

[asuri]

No Sir, this is actually a part of assignment where the part 1 asks me to make a function to check if the sudoku has a solution based on the user inputs, only if there is a solution then the solver() function gets activated.