Compilare: user.cpp: In function ‘int subsecv(std::string, std::string)’: user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<=c1.size(); i++) ^ user.cpp:24:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<=c2.size(); j++) ^ user.cpp:29:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=c1.size(); i++) ^ user.cpp:31:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<=c2.size(); j++) ^ user.cpp: In function ‘int simil(int, std::string, std::string)’: user.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(c2.size()<=k) ^ user.cpp:57:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(c2.size()-sub<=k) ^