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#include <iostream> using namespace std; int main() { int a,b,c,d[10000]; cin >>a; for(int i=0; i<a; i++){ cin >> b >> c; d[i]=(c-b%c); if(b%c==0){ d[i]=0; } else{ d[i]=(c-b%c); } } for(int i=0; i<a; i++){ cout << d[i] << endl; } }
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