Compilare: user.cpp: In function ‘bool ver(int, int)’: user.cpp:54:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(aa != s[host].size() && curr != s[to].size()) { ^ user.cpp:54:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(aa != s[host].size() && curr != s[to].size()) { ^ user.cpp:59:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(curr == s[to].size()) ^ user.cpp: In function ‘int main()’: user.cpp:89:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < s[bst].size();i++) ^ user.cpp:106:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < s[afis[j]].size();i++) ^ user.cpp:66:39: 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:67:41: 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); ^ user.cpp: In function ‘char next()’: user.cpp:33:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUF, fin), pos = 0; ^