Compilare: user.cpp: In function ‘void build_node(int, int)’: user.cpp:9:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[x].size()>=i && v[v[x][i-1]].size()>=i && v[v[v[x][i-1]][i-1]].size()>=i && v[v[v[v[x][i-1]][i-1]][i-1]].size()>=i) ///daca x are 4^i ancestor-i ^ user.cpp:9:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[x].size()>=i && v[v[x][i-1]].size()>=i && v[v[v[x][i-1]][i-1]].size()>=i && v[v[v[v[x][i-1]][i-1]][i-1]].size()>=i) ///daca x are 4^i ancestor-i ^ user.cpp:9:85: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[x].size()>=i && v[v[x][i-1]].size()>=i && v[v[v[x][i-1]][i-1]].size()>=i && v[v[v[v[x][i-1]][i-1]][i-1]].size()>=i) ///daca x are 4^i ancestor-i ^ user.cpp:9:127: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[x].size()>=i && v[v[x][i-1]].size()>=i && v[v[v[x][i-1]][i-1]].size()>=i && v[v[v[v[x][i-1]][i-1]][i-1]].size()>=i) ///daca x are 4^i ancestor-i ^ user.cpp: In function ‘int ask_node(int, int)’: user.cpp:18:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if((1<<(2*pas))<=y) ^