HDU-6019 MG loves gold

MG loves gold

 

 

Description

MG is a lucky boy. He is always be able to find gold from underground.

It is known that the gold is a sequence with $n$ elements, which has its own color $C$.

MG can dig out a continuous area of sequence every time by using one shovel, but he's unwilling to dig the golds of the same color with one shovel.

As a greedy person, he wish to take all the n golds away with least shovel.
The rules also require MG not to dig twice at the same position.

MG thought it very easy and he had himself disdained to take the job. As a bystander, could you please help settle the problem and calculate the answer?

 

Input

The first line is an integer $T$ which indicates the case number.($1<=T<=10$)

And as for each case, there are $1$ integer $n$ in the first line which indicate gold-number($1<=n<=100000$).

Then there are $n$ integers $C$ in the next line, the x-th integer means the x-th gold’s color($|C|<=2000000000$).

 

Output

As for each case, you need to output a single line.

there should be one integer in the line which represents the least possible number of shovels after taking away all $n$ golds.

 

Sample Input

 2

5

1 1 2 3 -1

5

1 1 2 2 3

 

Sample Output

 2

3

 

 

#include<iostream>

#include<stdio.h>

#include<algorithm>

#include<cstring>

#include<map>

using namespace std;

 

int main()

{

    int T;

    scanf("%d",&T);

    while(T--)

    {

        int n;

        scanf("%d",&n);

        int i,a[100008],sum=1;

        for(i=0;i<n;i++)

        {

            scanf("%d",&a[i]);

        }

        map<int,int>t;

        t[a[0]]=1;

        for(i=1;i<n;i++)

        {

            if(t[a[i]]==1)

            {

                sum++;

                t.clear();

                t[a[i]]=1;//中间一定要注意清空

            }

            else

            {

                t[a[i]]=1;

            }

        }

        printf("%d\n",sum);

    }

    return 0;

}

 

 

 

 

 

题意：用一把铲子去挖宝石，每个宝石都有自己的颜色（宝石上面的数字代表颜色），可以连续着挖一段，但是同一把铲子不能挖到同一种颜色的宝石，问最少用多少铲子可以把宝石挖完。