Compilare: main.cpp: In function 'long long int findmin()': main.cpp:13:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;++i) ~^~~ main.cpp: In function 'void form(long long int)': main.cpp:23:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;++i) ~^~~ main.cpp: In function 'int main()': main.cpp:33:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<=n)x[i].f=v[i],x[i].s=i; ~^~~ main.cpp:28:23: warning: unused variable 'a' [-Wunused-variable] long long p,pos,i,a,k,s=0; ^