Compilare: user.cpp: In function ‘bool subs(int, int)’: user.cpp:52:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < S[b].size() && pos < S[a].size() ; ++i) ^ user.cpp:52:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < S[b].size() && pos < S[a].size() ; ++i) ^ user.cpp:56:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return (pos == S[a].size()); ^ user.cpp: In function ‘int main()’: user.cpp:64:28: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, SZ, 1, fin); ^