Compilare: user.c: In function ‘main’: user.c:29:9: warning: unused variable ‘activeCol’ [-Wunused-variable] int activeCol = 0; ^ user.c: In function ‘readData’: user.c:14:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&N,&M); ^ user.c:18:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&mat[i][j]); ^