Compilare: main.cpp: In function 'void generare(int)': main.cpp:12:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(comb.size() == k){ ~~~~~~~~~~~~^~~~ main.cpp:13:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<comb.size();i++) cout << comb[i] << ' '; ~^~~~~~~~~~~~ main.cpp:17:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(comb.size() == k){ ~~~~~~~~~~~~^~~~ main.cpp:18:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<comb.size();i++) cout << comb[i] << ' '; ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:31:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("combinari.in", "r", stdin); ^ main.cpp:32:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("combinari.out", "w", stdout); ^