Light OJ -- 1212(Double Ended Queue)

To learn dequeue:
In bangla:http://www.shafaetsplanet.com/?p=2316
Learn function:https://www.cplusplus.com/reference/deque/deque/

///Bismillahir Rahmanir Rahim
///Author:Tanvir Ahmmad
///CSE,Islamic University,Bangladesh

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<sstream>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<iterator>
#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array
/*every external angle sum=360 degree
  angle find using polygon hand(n) ((n-2)*180)/n*/
///Floor[Log(b)  N] + 1 = the number of digits when any number is represented in base b
using namespace std;
typedef long long ll;
int main()
{
    int tst,sz,step,num,ca=1;
    scanf("%d",&tst);
    while(tst--)
    {
        printf("Case %d:\n",ca++);
        deque<int>dq;
        scanf("%d%d",&sz,&step);
        while(step--)
        {
            string str;
            cin>>str;
            if(str=="pushLeft")
            {
                cin>>num;
                if(dq.size()<sz) dq.push_front(num),printf("Pushed in left: %d\n",num);
                else printf("The queue is full\n");
            }
            else if(str=="pushRight")
            {
                cin>>num;
                if(dq.size()<sz) dq.push_back(num),printf("Pushed in right: %d\n",num);
                else printf("The queue is full\n");
            }
            else if(str=="popLeft")
            {
                if(dq.size()>=1) printf("Popped from left: %d\n",dq.front()),dq.pop_front();
                else printf("The queue is empty\n");
            }
            else if(str=="popRight")
            {
                if(dq.size()>=1) printf("Popped from right: %d\n",dq.back()),dq.pop_back();
                else printf("The queue is empty\n");
            }
        }
    }
    return 0;
}

///Alhamdulillah 
Problem Link:https://lightoj.com/problem/double-ended-queue

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