Compilare: main.c: In function 'main': main.c:5:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pietre.in","r",stdin),freopen("pietre.out","w",stdout),scanf("%d",&t),f[0]=f[1]=l=1; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pietre.in","r",stdin),freopen("pietre.out","w",stdout),scanf("%d",&t),f[0]=f[1]=l=1; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:66: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("pietre.in","r",stdin),freopen("pietre.out","w",stdout),scanf("%d",&t),f[0]=f[1]=l=1; ^~~~~~~~~~~~~~ main.c:18:8: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y),printf("%d\n",1+(z[x]==y&&z[y]==x)); ^~~~~~~~~~~~~~~~~~~