Compilare: main.cpp: In function 'int main()': main.cpp:13:80: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized] 13 | return (double)sqrt((v[a].x - v[b].x) * (v[a].x - v[b].x) + (v[a].y - v[b].y) * (v[a].y - v[b].y)); | ~~~~~^ main.cpp:19:13: note: 'b' was declared here 19 | int n,a,b; | ^