Compilare: user.cpp: In function ‘bool validdr(int, int)’: user.cpp:19:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return x<Q[i].size(); ^ user.cpp: In function ‘void computeS_Sp()’: user.cpp:31:14: warning: statement has no effect [-Wunused-value] for(j;j<=n;j++) ^ user.cpp: In function ‘int mode(int, int)’: user.cpp:60:23: warning: unused variable ‘cond3’ [-Wunused-variable] int cond1, cond2, cond3; ^ user.cpp: In function ‘int main()’: user.cpp:169:12: warning: unused variable ‘j’ [-Wunused-variable] {int m,i,x,j,y; ^