Compilare: user.c:4:1: warning: data definition has no type or storage class [enabled by default] a[31252],t,n,m,i,j; ^ user.c:4:1: warning: type defaults to ‘int’ in declaration of ‘a’ [enabled by default] user.c:4:10: warning: type defaults to ‘int’ in declaration of ‘t’ [enabled by default] a[31252],t,n,m,i,j; ^ user.c:4:12: warning: type defaults to ‘int’ in declaration of ‘n’ [enabled by default] a[31252],t,n,m,i,j; ^ user.c:4:14: warning: type defaults to ‘int’ in declaration of ‘m’ [enabled by default] a[31252],t,n,m,i,j; ^ user.c:4:16: warning: type defaults to ‘int’ in declaration of ‘i’ [enabled by default] a[31252],t,n,m,i,j; ^ user.c:4:18: warning: type defaults to ‘int’ in declaration of ‘j’ [enabled by default] a[31252],t,n,m,i,j; ^ user.c:5:1: warning: return type defaults to ‘int’ [enabled by default] main(){freopen("pietre.in","r",stdin);freopen("pietre.out","w",stdout); ^ user.c: In function ‘main’: user.c:5:15: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] main(){freopen("pietre.in","r",stdin);freopen("pietre.out","w",stdout); ^ user.c:5:46: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] main(){freopen("pietre.in","r",stdin);freopen("pietre.out","w",stdout); ^ user.c:6:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] for(scanf("%d",&t);t--;){ ^ user.c:7:6: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m);if(n>m)m^=n,n^=m,m^=n;m-=n; ^