Compilare: In file included from /usr/include/c++/4.8/cassert:43:0, from user.cpp:3: user.cpp: In function ‘int bs_first_greater_or_equal(std::vector<int>&, int, int, int)’: user.cpp:23:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(l >= 0 && r < v.size() + 1); ^ user.cpp:26:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(m >= 0 && m < v.size()); //m points to an actual element inside the vector ^ user.cpp: In function ‘int bs_last_lesser_or_equal(std::vector<int>&, int, int, int)’: user.cpp:38:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(l >= -1 && r < v.size()); ^ user.cpp:41:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(m >= 0 && m < v.size()); //m points to an actual element inside the vector ^ user.cpp: In function ‘int main()’: user.cpp:98:11: warning: ‘ret’ may be used uninitialized in this function [-Wmaybe-uninitialized] out<<ret<<endl; ^