Compilare: user.c: In function ‘pivot’: user.c:24:5: warning: implicit declaration of function ‘rand’ [-Wimplicit-function-declaration] i=st+(rand()%(dr-st+1)); ^ user.c: In function ‘main’: user.c:55:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.c:57:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^