Compilare: user.cpp: In function ‘void ve(int, int, int, int)’: user.cpp:17:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p=0;p<x[r].size();p++) ^ user.cpp: In function ‘int main()’: user.cpp:54:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p=0;p<x[h-1].size();p++) ^ user.cpp:53:22: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] char d; ^