24
12 12 12 12 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Right Answer is 6

You can solve this problem quickly by using the multiset and set data structures. To find the answer, use the set iterator.

"Some tram drivers are fans of fast driving, and they damage both rails and their trams. If a tram accelerates to a high speed, say 80 kilometers per hour, and then brakes sharply before a stop, it goes some distance skidding."
Is this "initial D" reference?!

Edited by author 19.08.2018 20:53

Edited by author 12.03.2016 20:21

var
A:array[1..1000] of integer;
i,s,n,b,r,m,j,k,d,q:integer;
begin
s:=0;
r:=0;
q:=0;
read(n);
for i:=1 to n do readln(A[i]);
begin
for i := 1 to n-1 do
        for j := 1 to n-i do
            if A[j] > A[j+1] then begin
                k := A[j];
                A[j] := A[j+1];
                A[j+1] := k
            end;
            end;

for i:=1 to (n-1) do begin
d:=i+q;
if (A[d]=A[d+1]) then s:=s+1 else s:=0;
if s=3 then begin r:=r+1; s:=0; q:=1+q; end;






end;
write(r);
end.

[code deleted]

Edited by moderator 19.11.2019 22:49

#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
    int i,n,a[155],k=0;
    cin>>n;
    for(i=0;i<n;i++)
        cin>>a[i];
    sort(a,a+n+1);
for(i=0;i<n;i++)
if(a[i]==a[i+3])
k++;
cout<<k;
    return 0;
}

import java.util.ArrayList;
import java.util.Scanner;

public class _1617 {
    public static void main(String[] args) throws Exception {
        Scanner s = new Scanner(System.in);
        ArrayList<Integer> list = new ArrayList<Integer>();
        int n, i, count1 = 0, count2 = 0;

        n = s.nextInt();
        int[] res = new int[n];
        for (i = 0; i < n; i++) {
            res[i] = s.nextInt();
            list.add(res[i]);
        }

        int e = 0;
        for (i = 0; i < list.size(); i++) {
            if (list.get(e).equals(res[i])) {
                count1++;
                if (count1 == 4) {
                    count2++;
                }
            }
        }
        System.out.println(count2);
    }
}

all the tires are of the same size and not different
telling coz got an ac

Edited by author 18.02.2012 07:18

here is my code



#include<stdio.h>
#include<stdlib.h>


int main()
{


    int n,a[150],i,j,c[150]={0},s=0,r;


scanf("%d",&n);



    for(i=0;i<n;i++)
    {

    scanf("%d",&a[i]);

                    }

  for(i=0;i<n;i++)
  {
                  for(j=i;j<n;j++)
                  {
                                    if(a[i]==a[j])
                                    {
                                    c[i]++;
                                    }
                                    }
                                    }


  for(i=0;i<n;i++)
  {
        r=c[i]/4;
         s=s+r;

        }

    if(n==c[0])
    {
    printf("%d\n",c[0]/4);
}
else
{
       printf("%d\n",s);
}






    return 0;



}

#include <stdio.h>
int main(){
    int i,n,j,m[151],d;
    scanf("%d",&n);
    for(i=0;i<n;++i)
        scanf("%d",&m[i]);
    for(i=0;i<n;++i)
        for(j=0;j<n;++j)
            if(m[i]<m[j]){
                d=m[i];
                m[i]=m[j];
                m[j]=d;
            }
    d=0;
    for(i=0;i<n-3;++i)
        if(m[i]==m[i+1])
            if(m[i+1]==m[i+2])
                if(m[i+2]==m[i+3])
                    if(m[i+3]>=600)
                        if(m[i+3]<=700){
            ++d;
            i=i+4;
        }

        printf("%d",d);
        return 0;
}

This is my source:
var
arn:array[1..150]of integer;
i,j,n,ans,t:integer;
begin
t:=1;ans:=0;
readln(n);
for i:=1 to n do
readln(arn[i]);
for i:=1 to n do
if arn[i]<>0 then
begin
for j:=1 to n do
begin
if (i<>j) and (arn[i]=arn[j]) then begin t:=t+1; arn[j]:=0 end;
if t=4 then begin t:=1; ans:=ans+1; end;
end;
t:=1;
end;
writeln(ans);
end.

Can anybody tell me, where mystake? I think to my programm is right. What is input in test  4?Help, please.

Can somebody help me? I've got WA on the test №3. I've got no idea what's wrong. Please, help me.
public void solve()throws Exception{
        int n = nextInt();
        int [] a = new int[101];
        int c =0,b;
        for (int i=0;i<n;i++){
            b = nextInt();
            a[b-600]++;
        }
        for (int i=0;i<101;i++){
            c+=a[i]>>1;
        }
        out.println(c>>2);
    }

The description says 4 pairs. That means 8 wheels. I got WA when I used that definition.

import java.util.Arrays;
import java.util.Scanner;


public class Example2 {

    private static int[] col;
    private static int count = 1;
    private static int superCount = 0;

    public static void main(String[] args) {
        try {
            Scanner scanner = new Scanner(System.in);
            int a = scanner.nextInt();
            if (a>=0 && a<=150){
                col = new int[a];
                for (int i = 0; i < a; i++) {
                    col[i]=scanner.nextInt();
                    if(col[i]<600 || col[i]>700){
                        //System.out.print("0");
                        throw new Exception();
                    }
                }
                Arrays.sort(col);
                for (int i = 1; i < col.length; i++) {
                    if (col[i]==col[i-1]) {
                        count ++;
                        if (count==4) {
                            superCount ++;
                            count=1;
                        }
                    }else count=1;
                }
                System.out.print(superCount);
            }else if (a>=0){System.out.print("0");}
        } catch (Exception e) {}
    }

}

why the wrong answer? please tell me test № 5. sorry for bad english.

Edited by author 09.11.2010 02:45

rt~~~

help me!!! What is 4th test?