Compilare: user.cpp: In function ‘int main()’: user.cpp:16:17: warning: format ‘%c’ expects argument of type ‘char*’, but argument 2 has type ‘int’ [-Wformat=] scanf("%c",a); ^ user.cpp:18:20: warning: NULL used in arithmetic [-Wpointer-arith] while(v[i][j]!=NULL) ^ user.cpp:20:28: warning: format ‘%c’ expects argument of type ‘char*’, but argument 2 has type ‘int’ [-Wformat=] scanf("%c",v[i][++j]); ^ user.cpp:42:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(j=1;j<i;++j) if(v[j][v[j][0]]==v[i][1]&&d[j]+1>=d[i]) ^