Compilare: user.cpp: In function ‘bool ver(int, int)’: user.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(aa != s[host].size() && curr != s[to].size()) { ^ user.cpp:26:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(aa != s[host].size() && curr != s[to].size()) { ^ user.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(curr == s[to].size()) ^ user.cpp: In function ‘int main()’: user.cpp:38:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interesant.in", "r", stdin); ^ user.cpp:39:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interesant.out", "w", stdout); ^