Code Chef:: FLOW002

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#include <iostream>
using namespace std ;

int main(){
    int T ;
    int A ;
    int B ;
    cin >> T ;
    int remainder[T] ;
    for (int i = 0; i < T; ++i) {
        cin >> A ;
        cin >> B ;
        remainder[i] = A%B ;
    }

    for (int i = 0; i < T; ++i) {
        cout << remainder[i] << '\n' ;

    }


    return 0 ;
}

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