Compilare: main.cpp: In function 'long long int calcul(long long int, long long int, long long int, long long int, long long int, long long int)': main.cpp:69:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:76:68: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%lld%lld%lld%lld%lld%lld",&x0,&rx,&nx,&y0,&ry,&ny); ^ main.cpp:74:55: warning: 'amax' may be used uninitialized in this function [-Wmaybe-uninitialized] long long x0 , rx , nx , y0 , ry , ny , sum , i , amax; ^~~~