Compilare: user.cpp: In function ‘int main()’: user.cpp:21:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < lin.length(); i ++ ) { ^ user.cpp:25:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < lin.size() && lin[i] != ' ' ) ^ user.cpp:28:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( len + lst.size() + str.length() <= n ) { ^ user.cpp:39:77: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1; i <= ( n - len ) / ( lst.size() - 1 ); i ++ ) ^