Compilare: user.c: In function ‘main’: user.c:18:3: warning: pointer targets in assignment differ in signedness [-Wpointer-sign] a=(int*)calloc(n,sizeof(int)); ^ user.c:19:3: warning: assignment from incompatible pointer type [enabled by default] t=(int**)malloc(n*sizeof(int*)); ^ user.c:21:7: warning: pointer targets in assignment differ in signedness [-Wpointer-sign] t[i]=(int*)calloc(n,sizeof(int)); ^ user.c:15:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("nucleulvaloros2.in","r",stdin); ^ user.c:16:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i",&n); ^ user.c:22:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i",&t[i][i]); ^ user.c:39:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("nucleulvaloros2.out","w",stdout); ^