Compilare: main.c: In function 'main': main.c:22:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("flori.in","r",stdin),freopen("flori.out","w",stdout),fread(p,1,M,stdin),n=A(),k=A(); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:22:35: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("flori.in","r",stdin),freopen("flori.out","w",stdout),fread(p,1,M,stdin),n=A(),k=A(); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:22:67: warning: ignoring return value of 'fread', declared with attribute warn_unused_result [-Wunused-result] freopen("flori.in","r",stdin),freopen("flori.out","w",stdout),fread(p,1,M,stdin),n=A(),k=A(); ^~~~~~~~~~~~~~~~~~