The Preliminary Contest for ICPC Asia Shanghai 2019 Digit sum

https://nanti.jisuanke.com/t/41422

#include
#define endl '\n'
#define mem(a) memset(a,0,sizeof(a)
#define debug cout<<1<>t;
    int cas=0;
    while(t--){
        ll n,b;
        cin>>n>>b;
        cout<<"Case #"<<++cas<<": "<

 

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