Compilare: main.cpp: In function 'bool contains(std::__cxx11::string, std::__cxx11::string)': main.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size()&&j<b.size();i++) ~^~~~~~~~~ main.cpp:13:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size()&&j<b.size();i++) ~^~~~~~~~~ main.cpp:17:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j==b.size()) return 1; ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<v.size();i++) ~^~~~~~~~~ main.cpp:46:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<itrs.size();j++) ~^~~~~~~~~~~~ main.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<itrs.size();i++) ~^~~~~~~~~~~~ main.cpp:23:39: 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); ^ main.cpp:24:41: 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); ^