Compilare: user.cpp: In function ‘void update(int, int, int)’: user.cpp:36:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<a[2*nod].size() && j<a[2*nod+1].size()) ^ user.cpp:36:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<a[2*nod].size() && j<a[2*nod+1].size()) ^ user.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<a[2*nod].size()) ^ user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<a[2*nod+1].size()) ^ user.cpp: In function ‘void query(int, int, int)’: user.cpp:128:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:165:17: warning: unused variable ‘nod’ [-Wunused-variable] int st, dr, nod, i, j, m, x1, y1, y2, x2; ^ user.cpp:165:25: warning: unused variable ‘j’ [-Wunused-variable] int st, dr, nod, i, j, m, x1, y1, y2, x2; ^