Compilare: user.cpp: In function ‘int is(std::string, int, int, int)’: user.cpp:26:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(loc + op.size() - 1 > dr) return 0; ^ user.cpp:28:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<op.size() && ok;++i) { ^ user.cpp: In function ‘int eval(int, int, int, std::map<char, int>&)’: user.cpp:43:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t = lvl;t<ops.size();++t) { ^ user.cpp:78:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<rez.size();++i) { ^ user.cpp: In function ‘std::string getp(std::string)’: user.cpp:101:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i) { ^ user.cpp: In function ‘int main()’: user.cpp:129:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();++j) { ^ user.cpp:112:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apel.in","r",stdin); ^ user.cpp:113:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apel.out","w",stdout); ^