16-03-02.cpp

more efftive 代码

#include <iostream>
#include <queue>
#include <cassert>
using namespace std;

int main() {
  queue<int> Q;
  Q.push(8);
  Q.push(7);
  Q.push(6);
  Q.push(2);
  
  assert(Q.size() == 4);
  assert(Q.back() == 2);

  assert(Q.front() == 8);
  Q.pop();

  assert(Q.front() == 7);
  Q.pop();

  assert(Q.front() == 6);
  Q.pop();

  assert(Q.front() == 2);
  Q.pop();

  assert(Q.empty());
}