I only use these varities:

    a,b    : array[0..100000]of integer;
    aa,f   : array[0..1000]of longint;
    i,j,k,m,n,q,h  : longint;

but I got MLE on test 15 when it was reading the data~~~

who can explain it for me ? Thank you very much.

faint……I got AC after I've changed integer into word!