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public void dup() {
T tmp = pop();
push(tmp);
push(tmp);
}
public T peek() {
return stack[sp-1];
}
public void swap() {
T tmp1 = pop();
T tmp2 = pop();
push(tmp1);
push(tmp2);
}
public void rot() {
rot(3);
}
public void rot(int n) {
T[] tmp = (T[]) new Object[n];
for(int i=0; i<n; i++)
tmp[i] = pop();
push(tmp[0]);
for(int i=n-1; i>0; i--)
push(tmp[i]);
}
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Author:TBVector
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