Compilare: main.cpp: In function 'int main()': main.cpp:12:25: warning: unused variable 'ult2' [-Wunused-variable] int n,k,i,j,rat,ult,ult2,prv; ^~~~ main.cpp:13:15: warning: unused variable 'sol' [-Wunused-variable] long long sol=0; ^~~ main.cpp:14:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&k); ^