Compilare: main.cpp: In function 'int main()': main.cpp:62:38: warning: 'd1' may be used uninitialized in this function [-Wmaybe-uninitialized] v[y1].push_back(make_pair(x1,-d1)); ^~~ main.cpp:41:12: warning: 'y1' may be used uninitialized in this function [-Wmaybe-uninitialized] int x1,y1,d1; ^~ main.cpp:41:9: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized] int x1,y1,d1; ^~