LeetCode #225 ImplementStackUsingQueue. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
큐를 쓰라고 했는데 그냥 벡터로 풀었음
It said using Queue, but used Vector
LeetCode #225
Q.
Implement the following operations of a stack using queues.
큐를 이용해서 스택의 함수들을 구현해라.
push(x) -- Push element x onto stack.
pop() -- Removes the element on top of the stack.
top() -- Get the top element.
empty() -- Return whether the stack is empty.
e.g.
MyStack stack = new MyStack();
stack.push(1);
stack.push(2);
stack.top(); // returns 2
stack.pop(); // returns 2
stack.empty(); // returns false
//Process 1
//There is no process, just implemented
//처리과정 1
//따로 처리과정은 없고, 그냥 vector로 stack 구현함
Code.. lemme see code!!!
코드.. 코드를 보자!!!
#include <iostream>
#include <vector>
using namespace std;
class MyStack {
private:
vector<int> data;
public:
/** Initialize your data structure here. */
MyStack() {
//this->data = new vector<int>();
}
/** Push element x onto stack. */
void push(int x) {
data.push_back(x);
}
/** Removes the element on top of the stack and returns that element. */
int pop() {
int temp = data.at(data.size() - 1);
data.erase(data.begin() + data.size() - 1);
return temp;
}
/** Get the top element. */
int top() {
return data.at(data.size() - 1);
}
/** Returns whether the stack is empty. */
bool empty() {
bool isEmpty = true;
if (data.size() > 0)
return false;
return isEmpty;
}
};
/**
* Your MyStack object will be instantiated and called as such:
* MyStack obj = new MyStack();
* obj.push(x);
* int param_2 = obj.pop();
* int param_3 = obj.top();
* bool param_4 = obj.empty();
*/
int main(int args, char *argv[]) {
cout << "Hello world" << endl;
MyStack stack;
stack.push(1);
stack.push(2);
cout << stack.top() << endl; // returns 2
cout << stack.pop() << endl; // returns 2
cout << stack.empty() << endl; // returns false
}
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