Compilare: user.c: In function ‘mark’: user.c:10:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(v[mat[i][j]]==1) ^ user.c:19:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(v[mat[i][j]]==1) ^ user.c: In function ‘main’: user.c:32:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ user.c:35:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&mat[i][j]); ^