Compilare: user.cpp: In function ‘int caut2(int, int)’: user.cpp:26:37: warning: unused variable ‘ret’ [-Wunused-variable] int st = 0, dr = b[v].size()-1, ret = 0; ^ user.cpp: In function ‘int main()’: user.cpp:81:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<b[i].size();++j) { ^ user.cpp: In function ‘int caut2(int, int)’: user.cpp:37:1: warning: control reaches end of non-void function [-Wreturn-type] } ^