Compilare: main.cpp: In function 'int main()': main.cpp:89:27: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized] out<<l-(abs(a-x)+abs(b-y))<<'\n'; ~^~ main.cpp:89:18: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized] out<<l-(abs(a-x)+abs(b-y))<<'\n'; ~^~