Compilare: user.cpp: In function ‘int main()’: user.cpp:45:94: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] d[mat[cif][i]][(r*10+cif)%k][j&1]=d[mat[cif][i]][(r*10+cif)%k][j&1]+d[i][r][1-j&1]; ^ user.cpp:51:30: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] con=con+d[i][0][1-j&1]; ^ user.cpp:55:23: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] d[i][r][1-j&1]=0; ^ user.cpp:12:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d" ,&k,&a,&b); ^