Compilare: user.cpp: In function ‘void lee0(std::pair<int, int>, std::pair<int, int>)’: user.cpp:76:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i = 0; i < l2sz; i++) ^ user.cpp: In function ‘void leek1(std::pair<int, int>, std::pair<int, int>)’: user.cpp:109:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i = 0; i < l2sz; i++) ^ user.cpp: In function ‘void leek2(std::pair<int, int>, std::pair<int, int>)’: user.cpp:142:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i = 0; i < l2sz; i++) ^ user.cpp: In function ‘void leek1k2(std::pair<int, int>, std::pair<int, int>)’: user.cpp:175:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i = 0; i < l2sz; i++) ^