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| 1 | +// Find if a string is palindrome or not using DeQue |
| 2 | +#include<iostream> |
| 3 | +using namespace std; |
| 4 | + |
| 5 | +#define MAX 100 |
| 6 | + |
| 7 | +int size, Q[MAX], front=-1, rear=-1, x; |
| 8 | + |
| 9 | +void insert_rear(int x) |
| 10 | +{ |
| 11 | + if(front==-1) |
| 12 | + front=0; |
| 13 | + rear++; |
| 14 | + Q[rear]=x; |
| 15 | +} |
| 16 | + |
| 17 | +int delete_from_front() |
| 18 | +{ |
| 19 | + if(front==-1) |
| 20 | + cout<<"DeQueue is Empty\n"; |
| 21 | + if (front==rear) |
| 22 | + { |
| 23 | + int d=Q[front]; |
| 24 | + front=rear=-1; |
| 25 | + return d; |
| 26 | + } |
| 27 | + |
| 28 | + else if (front==size-1) |
| 29 | + { |
| 30 | + int d=Q[front]; |
| 31 | + front=0; |
| 32 | + return d; |
| 33 | + } |
| 34 | + else |
| 35 | + { |
| 36 | + int d=Q[front]; |
| 37 | + front=front+1; |
| 38 | + return d; |
| 39 | + } |
| 40 | +} |
| 41 | + |
| 42 | +int delete_from_rear() { |
| 43 | + if(front==-1) |
| 44 | + cout<<"DeQueue is Empty\n"; |
| 45 | + if (front==rear) |
| 46 | + { |
| 47 | + int d=Q[rear]; |
| 48 | + front=rear=-1; |
| 49 | + return d; |
| 50 | + } |
| 51 | + else if (rear==0) |
| 52 | + { |
| 53 | + int d=Q[rear]; |
| 54 | + rear=size-1; |
| 55 | + return d; |
| 56 | + |
| 57 | + } |
| 58 | + else |
| 59 | + { |
| 60 | + int d=Q[rear]; |
| 61 | + rear=rear-1; |
| 62 | + return d; |
| 63 | + } |
| 64 | +} |
| 65 | + |
| 66 | +int main() |
| 67 | +{ |
| 68 | + int c,a,b,flag=0,cnt=0; |
| 69 | + char ele[MAX]; |
| 70 | + cout<<"Enter the string: "; |
| 71 | + gets(ele); |
| 72 | + for(int j=0; ele[j] != '0円'; j++) |
| 73 | + { |
| 74 | + cnt++; |
| 75 | + } |
| 76 | + size=cnt; |
| 77 | + int count=size/2; |
| 78 | + for (int i=0;i<size;i++) |
| 79 | + { |
| 80 | + insert_rear(ele[i]); |
| 81 | + } |
| 82 | + while(count>0) |
| 83 | + { |
| 84 | + a=delete_from_front(); |
| 85 | + b=delete_from_rear(); |
| 86 | + if(a!=b) |
| 87 | + flag=1; |
| 88 | + count--; |
| 89 | + } |
| 90 | + if(flag==0) |
| 91 | + cout<<"\nString is a Pallindrome\n"; |
| 92 | + else |
| 93 | + cout<<"\nString is not a Pallindrome\n"; |
| 94 | + return 0; |
| 95 | +} |
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