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41 lines (33 loc) · 690 Bytes
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232.cpp
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41 lines (33 loc) · 690 Bytes
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class MyQueue {
public:
MyQueue() {
}
void push(int x) {
inStack.push(x);
}
int pop() {
if(outStack.empty()) {
in2out();
}
int x = outStack.top();
outStack.pop();
return x;
}
int peek() {
if (outStack.empty()) {
in2out();
}
return outStack.top();
}
bool empty() {
return inStack.empty() && outStack.empty();
}
private:
stack<int> inStack, outStack;
void in2out() {
while(!inStack.empty()) {
outStack.push(inStack.top());
inStack.pop();
}
}
};