B3956[GESP202403三级]字母求和题解当时在考试，3分钟A了，结果第二题T了。#include<bits/stdc++.h>usingnamespacestd;constintN=1e5+2;constintN1=1e3+2;typedeflonglongll;typedefunsignedlonglongull;#definefo(i,n,m)for(inti=n;i<=m;i++)