Compilare: user.cpp: In function ‘void bin(std::string)’: user.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (x.size()==n) a.push_back(x); ^ user.cpp: In function ‘int csc(std::string, std::string)’: user.cpp:25:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0,j=-1; i<=s.size()-x.size(); i++,j=-1) ^ user.cpp:28:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=1; j<x.size();j++) ^ user.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j==x.size()) ^ user.cpp: In function ‘void ty(std::string)’: user.cpp:48:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a.size(); i++) ^ user.cpp:54:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (q==a.size()) ver(x); ^ user.cpp: At global scope: user.cpp:59:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^