Compilare: user.cpp: In function ‘int main()’: user.cpp:60:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < used . size (); ++ j) ^ user.cpp:80:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz < V [row] . size () - 1) ^ user.cpp:88:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k >= V [row] . size () - 1) break; ^ user.cpp: In function ‘int bin_search(int, int, int, int, int)’: user.cpp:19:1: warning: control reaches end of non-void function [-Wreturn-type] } ^