Compilare: main.c: In function 'P': main.c:6:25: warning: implicit declaration of function 'rand' [-Wimplicit-function-declaration] int i=b-1,j=c+1,p=a[b+(rand()%(c-b+1))],l; ^~~~ main.c: In function 'main': main.c:27:6: warning: implicit declaration of function 'srand' [-Wimplicit-function-declaration] for(srand(time(NULL)),scanf("%d%d",&n,&k),i=1;i<=n;i++) ^~~~~ main.c:26:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("sdo.in","r",stdin),freopen("sdo.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:26:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("sdo.in","r",stdin),freopen("sdo.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:27:24: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] for(srand(time(NULL)),scanf("%d%d",&n,&k),i=1;i<=n;i++) ^~~~~~~~~~~~~~~~~~~ main.c:28:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",a+i); ^~~~~~~~~~~~~~~