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SolveJosephus.cpp
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136 lines (122 loc) · 1.94 KB
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#include<iostream>
using namespace std;
class CircularQueue{
private:
int r;
int f;
int size;
int *arr;
public:
CircularQueue(int k);
int front();
int rear();
bool enqueue(int value);
bool dequeue();
bool isEmpty();
bool isFull();
};
CircularQueue::CircularQueue(int k)
{
f=-1;
r=-1;
size=k;
arr=new int[k];
}
int CircularQueue::front()
{
if(f==-1){
return -1;
}
else{
return arr[f];
}
}
int CircularQueue::rear()
{
if(f==-1){
return -1;
}
else{
return arr[r];
}
}
bool CircularQueue::enqueue(int value)
{
if ((f == 0 && r==size-1) || (r==(f-1))){
return false;
}
else if(f==-1){
f=0;
r=0;
arr[r]=value;
}
else if(r==size-1 && f!=0){
r=0;
arr[r]=value;
}
else{
r++;
arr[r] = value;
}
return true;
}
bool CircularQueue::dequeue()
{
if (f==-1){
return false;
}
arr[f]=-1;
if (f==r){
f=-1;
r=-1;
}
else if(f==size-1)
f=0;
else
f++;
return true;
}
bool CircularQueue::isEmpty()
{
if(f==-1)
return true;
else
return false;
}
bool CircularQueue::isFull()
{
if ((f == 0 && r==size-1) || (r==(f-1))){
return true;
}
else{
return false;
}
}
int josephusprob(CircularQueue cq,int n){
int x;
while(!cq.isEmpty()){
for(int i=0;i<n;++i){
if(i<n-1){
int val=cq.front();
cq.dequeue();
cq.enqueue(val);
}
else{
x=cq.front();
cq.dequeue();
}
}
}
return x;
}
int main(){
int n,k;
cin>>n>>k;
CircularQueue jp(n);
for(int i=0;i<n;i++){
int id;
cin>>id;
jp.enqueue(id);
}
cout<<josephusprob(jp,k);
}