Compilare: user.cpp: In function ‘void parc(int)’: user.cpp:10:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[k].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:29:13: warning: variable ‘x1’ set but not used [-Wunused-but-set-variable] int x,y,x1,y1; ^