Compilare: main.c: In function 'P': main.c:24:25: 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:45:6: warning: implicit declaration of function 'srand' [-Wimplicit-function-declaration] for(srand(time(NULL)),n=A(),k=A(),i=1;i<=n;i++) ^~~~~ main.c: In function 'N': main.c:9:9: warning: ignoring return value of 'fread', declared with attribute warn_unused_result [-Wunused-result] fread(r,1,R,stdin),o=0; ^~~~~~~~~~~~~~~~~~ main.c: In function 'main': main.c:44:5: 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:44:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("sdo.in","r",stdin),freopen("sdo.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~