sort(arr,arr+n,cmp); int top = 1;
for(i = 1; i < n ; i ++)
if(arr[i] != arr[i-1]) arr[top++] = arr[i]; n = top;
for(i = 0 ; i < n - 1; i ++) {
LL gcd = Gcd(arr[i],arr[i+1]); Fs[i].up = arr[i] / gcd; Fs[i].down = arr[i+1] / gcd; }
LL x = Fs[0].up; for(i = 0 ; i < n - 1 ; i ++) x = Get(x,Fs[i].up); LL y = Fs[0].down; for(i = 0 ; i < n - 1; i ++) y = Get(y,Fs[i].down); printf(\ return 0; }
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