Compilare: main.cpp: In function 'void compute()': main.cpp:83:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1;i < tour.size();i++){ ~~^~~~~~~~~~~~~ main.cpp:86:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 2;i <= tour.size() - 1;i++){ ~~^~~~~~~~~~~~~~~~~~ main.cpp:91:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1;j + lung - 1 <= tour.size() - 1;j++){ ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp:82:13: warning: unused variable 'lung' [-Wunused-variable] int i,j,lung; ^~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:14:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^