# Delete

Time Limit: 1 Sec  Memory Limit: 256 MB

## 题目连接

http://acm.hdu.edu.cn/showproblem.php?pid=5210

## Description

wld有n个数(a1,a2,...,an)，他希望进行k次删除一个数的操作，使得最后剩下的n−k个数中有最多的不同的数,保证1≤n≤100,0≤k<n,1≤ai≤n(对于任意1≤i≤n)

4
1 3 1 2
1

3

## HINT

```//qscqesze
#include <cstdio>
#include <cmath>
#include <cstring>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
#include <sstream>
#include <queue>
#include <typeinfo>
#include <fstream>
#include <map>
#include <stack>
typedef long long ll;
using namespace std;
//freopen("D.in","r",stdin);
//freopen("D.out","w",stdout);
#define sspeed ios_base::sync_with_stdio(0);cin.tie(0)
#define maxn 200001
#define mod 10007
#define eps 1e-9
int Num;
char CH[20];
//const int inf=0x7fffffff;   //нчоч╢С
const int inf=0x3f3f3f3f;
/*

inline void P(int x)
{
Num=0;if(!x){putchar(‘0‘);puts("");return;}
while(x>0)CH[++Num]=x%10,x/=10;
while(Num)putchar(CH[Num--]+48);
puts("");
}
*/
//**************************************************************************************
{
int x=0,f=1;char ch=getchar();
while(ch<‘0‘||ch>‘9‘){if(ch==‘-‘)f=-1;ch=getchar();}
while(ch>=‘0‘&&ch<=‘9‘){x=x*10+ch-‘0‘;ch=getchar();}
return x*f;
}
inline void P(int x)
{
Num=0;if(!x){putchar(‘0‘);puts("");return;}
while(x>0)CH[++Num]=x%10,x/=10;
while(Num)putchar(CH[Num--]+48);
puts("");
}

int a[101];
int main()
{
int n;
while(scanf("%d",&n)!=EOF)
{
for(int i=1;i<=n;i++)
a[i]=0;
for(int i=1;i<=n;i++)
{
a[tmp]=1;
}
k=n-k;
int ans=0;
for(int i=1;i<=n;i++)
{
if(a[i])
ans++;
}
P(min(ans,k));
}
}```

## HDU 2092 整数解 --- 水题

x+y = n, x*y = m; y = n - x; x * ( n - x) = m nx - x^2 = m; x^2 - nx + m = 0; △ = sqrt(n^2 - 4m) 要有整数解即△需要为可开方数即可. /* HDU 2092 整数解 --- 水题 */ #include <cstdio> #include <cmath> int main() { double n, m; while (scanf("%lf%lf", &n,

## hdu 4802 GPA 水题

GPA Time Limit: 20 Sec  Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=4802 Description In college, a student may take several courses. for each course i, he earns a certain credit (ci), and a mark ranging from A to F, which is c

## hdu 5495 LCS 水题

LCS Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5495 Description 你有两个序列\{a_1,a_2,...,a_n\}{a?1??,a?2??,...,a?n??}和\{b_1,b_2,...,b_n\}{b?1??,b?2??,...,b?n??}. 他们都是11到nn的一个排列. 你需要找到另一个排列\{p_1,p_2,...,p_n\}{p?1?

## hdu 5326 Work 水题

Work Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 225    Accepted Submission(s): 166 Problem Description It’s an interesting experience to move from ICPC to work, end my college life and star

## hdu 4493 Tutor 水题

Tutor Time Limit: 20 Sec  Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=4493 Description Lilin was a student of Tonghua Normal University. She is studying at University of Chicago now. Besides studying, she worked as a tutor tea