Compilare: main.cpp: In function 'int main()': main.cpp:109:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int x = 0; x < dv.size (); x++) { ~~^~~~~~~~~~~~ main.cpp:66:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("tenerife.in", "r", stdin); ^ main.cpp:67:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("tenerife.out", "w", stdout); ^