Compilare: user.c: In function ‘quicksort’: user.c:8:5: warning: implicit declaration of function ‘time’ [-Wimplicit-function-declaration] srand(time(NULL)); ^ user.c:19:38: warning: operation on ‘*(a + (sizetype)((unsigned int)iR * 4u))’ may be undefined [-Wsequence-point] {a[iL]=a[iL]+a[iR]-(a[iR]=a[iL]); ^ user.c: At top level: user.c:28:1: warning: return type defaults to ‘int’ [enabled by default] main() ^ user.c: In function ‘main’: user.c:35:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%i %i %i",&N,&A,&B); ^ user.c:39:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%i",&x); ^