Compilare: main.cpp: In function 'double sol(std::vector<punct>&, int, int)': main.cpp:66:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<=pct_closest.size()-8; ++i) ~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:72:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<pct_closest.size(); ++j) ~^~~~~~~~~~~~~~~~~~~ main.cpp:57:9: warning: unused variable 'ct' [-Wunused-variable] int ct=0; ^~