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    void update(int *a,int *b) {
        int temp = *a; // copy the value of a 
        *a = *a + *b; 
        *b = abs(temp - *b);      
    }
    int main() {
        int a, b;
        int *pa = &a, *pb = &b;
        
        scanf("%d %d", &a, &b);
        update(pa, pb);
        printf("%d\n%d", a, b);
    
        return 0;
    }