10327 - Flip Sort

[pok]

thanks a lot..

i got it..

take care...bye ....

[rubelreza]

WHY I M GETTING WA???
CAN ANYONE TELL ME PLEASE..



#include<stdio.h>

int main(){

char s[1000];
int i,j,M=0,n,a,b;

while(scanf("%d\n",&n)==1){
M=0;
for(i=0;i<n;i++){
scanf("%d",&s);}


for(b=0;b<n-1;b++){
for(j=0;j<n-1;j++){

if(s[j]>s[j+1])
{
a=s[j];
s[j]=s[j+1];
s[j+1]=a;
M++;
}}}
printf("Minimum exchange operations : %d\n",M);

}

return 0;
}

[Obaida]

Your approach seems wrong to me.
Just do bubble sort and don't exchange the values just count how many ways.

And read the whole thread before posting. There are many discussion about it.
>>Use code tags while posting your code.

[tanjima09]

#include <iostream>
#include <algorithm>
#include <algo.h>
using namespace std;

int main ()
{
int a[1002],n,i,count=0;

while(cin >> n)
{
if(n<=0)
break;
count=0;
for (i=0; i<n; i++)
cin >>a;


while (!is_sorted(a,a+n))
{
for (i=0; i<n; i++)
{
if (a>a[i+1])
{
swap(a, a[i+1]);
count++;
}
}
}
cout<<"Minimum exchange operations : "<<count<<endl;
}
return 0;
}

[tanjima09]

Code: Select all

#include <iostream>
#include <algorithm>
#include <algo.h>
using namespace std;

int main ()
{
	int a[1002],n,i,count=0;
		
	while(cin >> n)
	{
	if(n<=0)	
		break;
		
	count=0;
		for (i=0; i<n; i++)
			cin >>a[i];
		
		
	while (!is_sorted(a,a+n))
			{
			for (i=0; i<n; i++)	 
				{
				if (a[i]>a[i+1])	
					{
					swap(a[i], a[i+1]);
					count++;
					}
				
				}
			
			}
			cout<<"Minimum exchange operations : "<<count<<endl;

	
	}	 	 	  
	return 0;
}

i am getting a WA, i don't know what is the problem.. please help me with this....

[sazzadcsedu]

Your code is not correct.
Things to note:

for (i=0; i<n; i++)
cin >>a;

for (i=0; i<n; i++)
{
if (a>a[i+1]) .....//problem here

look here you r comparing a[n-1]>a[n] when i=n-1(final pass).but what is the index of last element in a[]??is it n or n-1???
so write i<n-1 rather than n.

you have used #include <algo.h> i dont know what is this
you have also used several built in function like is_sorted,swap.
i think u shouldn't use built in function for such a simple problem if you want to learn programing.
you should code this bubble sort manually.

here is ACC version of your code.try to understand the code.and write yourself.

Code: Select all

 removed.

[tanjima09]

thanks for ur reply.nw i understand where the problem was actually... yes i got an AC.. anywaz. i can do that by bubble sort. but i use those functions just because i want to. another thing is that <algo.h> is a very old name from STL HP implementation.thnx for helping

[@mjad]

Code: Select all

#include<iostream>


using namespace std;

int main()
{
	//freopen("flip sort.txt","r",stdin);
	//freopen("flip sort output.txt","a+",stdout);

	unsigned long int i,c,j,num;
	char val[10],t;

    while(1)
	{
		 
			cin>>num;
			for(i=0;i<num;i++)
			{
				cin>>t;
				val[i]=t-48;
		
			}
			
	
			c=0;
			for(i=1;i<num;i++)
			{
				for(j=0;j<num-i;j++)
				{
					if(val[j]>val[j+1])
					{
						t=val[j];
						val[j]=val[j+1];
						val[j+1]=t;
						c++;
					}
				}
			}
	
			cout<<"Minimum exchange operation : "<<c<<endl;
		 
	}
	return 0;
}

[sazzadcsedu]

Keep in mind the following things :-

Do not open a new thread when it is already existing.There is a search box ,so search here for your problem.

Next thing your program is full of error.

1.you are using char val[10], but problem statement says there are at most 1000 number.So certainly you will get Runtime error.

2.If you be able to overcome Runtime error by increasing array size, you will certainly get Time limit exceed,because your program never terminate.

3.If you be able to overcome these two thing then you will certainly get Wrong answer.I don't know why you used char array to take integer number.if num is 10 what value your char type contain?Use integer array.

best of luck.

[@mjad]

thanks for your reply

now change my algorithm
but i have still same problem
why? help me

Code: Select all

//#include<iostream>
#include<stdio.h>

//using namespace std;


int main()
{
	//freopen("trainswapping.txt","r",stdin);

	int ks,l,i,j,m,n,t;
	long count=0;
	int num[1005];
	       count=0;
		scanf("%d",&l);
		for(j=0;j<l;j++)
		{
			scanf("%d",&num[j]);
		}
		for(m=0;m<l;m++)
		{
			for(n=0;n<l-m-1;n++)
			{
				if(num[n]>num[n+1])
				{
					t=num[n];
					num[n]=num[n+1];
					num[n+1]=t;
					count++;
				}
			}
		}
		printf("Minimum exchange operations : %ld\n",count);
 
	
	return 0;
}

[sazzadcsedu]

Your program still not terminating.
Use this

while(scanf("%d",&l)==1)
{

//write everything inside


}


And why you are saying your program receive Wrong answer, Wrong answer,time limit exceed ,Run time error these are not the same.And don't forget to initialize count before every case.

best of luck.

[@mjad]

i am really sorry for my mistake
thanks for your reply
now i go AC

[Shafaet_du]

Both merge sort and bubble sort can be used to solve this problem.

[asufcis]

I'm gettin WA don'y know why ?

Code: Select all

#include <iostream>
#include <iomanip>

using namespace std;
int main ()
{
	//freopen("input.in", "r", stdin);

int n,x[1003];
while(cin>>n)
{
for(int i=0;i<n;i++)
{cin>>x[i];}

int count=0;
///////////ARRANGING ARRAY (SORTING) --->HERE ASCENDING FOR EXAMPLE//////////////
for(int i=0;i<n;i++)
	for(int j=i+1;j<n;j++)
{
	if (x[i]>x[j]) /////Swapping
	{swap(x[i],x[j]);
	count++;
	}
}
//////////////////////END OF SORTING///////////////////////////////////////

	cout<<"Minimum exchange operations : "<<count<<endl;
	
}



	return 0;
}

[RoniphpBB]

WA and TLE after modify I can't understand what is my problem plz anyone help me
here is my code

Code: Select all

#include <set>
#include <map>
#include <list>
#include <cmath>
#include <ctime>
#include <queue>
#include <stack>
#include <cctype>
#include <cstdio>
#include <string.h>
#include <vector>
#include <cassert>
#include <cstdlib>
#include <cstring>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <stdio.h>
using namespace std;

int main()
{
    int i,T,n[1000],temp,swap=0;
    //vector<int>v;

    while(1)
    {
        cin>>T;
        if(T==0) break;

        for(i=0;i<T;i++)
        {
        cin>>n[i];
      //  v.push_back(n);
        }
        for(i=0;i<T-1;i++)
        {
            for(int j=i+1;j<T;j++)
            {
                if(n[i]>n[j])
                {
                    temp=n[i];
                    n[i]=n[j];
                    n[j]=temp;
                    swap++;
                }
            }
        }
        cout<<"Minimum exchange operations : "<<swap<<endl;
    swap=0;
    }
        //cout<<endl;
//        v.clear();

    return 0;

}