Compilare: user.cpp: In function ‘int main()’: user.cpp:85:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < end_at[i].size() ;++j) ^ user.cpp:50:6: warning: unused variable ‘val’ [-Wunused-variable] int val,left,right; ^ user.cpp: In function ‘int query(int, int, int, int, int)’: user.cpp:39:6: warning: ‘scor’ may be used uninitialized in this function [-Wmaybe-uninitialized] int scor; ^