Compilare: main.cpp: In function 'void solve()': main.cpp:143:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<positive.size(); ++i) ~^~~~~~~~~~~~~~~~ main.cpp:156:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i+1<sol.size(); ++i) ~~~^~~~~~~~~~~ main.cpp:174:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<sol.size(); ++i) ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:196:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tester.out", "w", stdout); ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:32:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^