Compilare: main.c:2:28: warning: overflow in implicit constant conversion [-Woverflow] long long y,a,b,e,c[500],m=1e40,n,i,j,k; ^~~~ main.c: In function 'main': main.c:5:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pitagora2.in","r",stdin),freopen("pitagora2.out","w",stdout),scanf("%lld",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:39: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("pitagora2.in","r",stdin),freopen("pitagora2.out","w",stdout),scanf("%lld",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:75: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("pitagora2.in","r",stdin),freopen("pitagora2.out","w",stdout),scanf("%lld",&n); ^~~~~~~~~~~~~~~~