Compilare: user.cpp: In function ‘double solve(int, int, pii*)’: user.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v.size();++i) ^ user.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<v.size();++j) ^ user.cpp: In function ‘int main()’: user.cpp:60:6: warning: unused variable ‘k’ [-Wunused-variable] int k,i,lg=1,dir; ^ user.cpp:60:10: warning: unused variable ‘lg’ [-Wunused-variable] int k,i,lg=1,dir; ^ user.cpp:60:15: warning: unused variable ‘dir’ [-Wunused-variable] int k,i,lg=1,dir; ^