/in/foo.cc: In function 'int check(int)':
/in/foo.cc:9:41: warning: array subscript -1 is below array bounds of 'long long int [200005]' [-Warray-bounds]
    9 |         if (minn<=num[1]&&minn+a>=num[-1]&&maxx>=minn) return 1;
      |                                   ~~~~~~^
/in/foo.cc:4:15: note: while referencing 'num'
    4 | long long t,n,num[N],sum,l,r,mid,maxx,ans,minn;
      |               ^~~