hdu 1425 sort

hdu 1425 sort

由于数的范围是限定的，考虑用哈希。

注意：此题不能用cin cout，会超时

#include<iostream>
#include<cstdio>
#include<cstring>
#define maxn 1000005
using namespace std;
bool ifhas[maxn];
int main(void){
    int n,m;
    while(scanf("%d %d",&n,&m)!=EOF){
        memset(ifhas,false,sizeof(ifhas));
        int a;
        int max = -100000000;
        int min = 100000000;
        for(int i = 1;i <= n;i ++){
            scanf("%d",&a);
            max = max > a?max:a;
            min = min < a?min:a;
            ifhas[a + 500000] = true;
        }
        int start = max + 500000;
        int end = min + 500000;
        for(int i = 1;i < m;i ++)
        {
            for(int j = start;j >= end;j --){
                
                if(ifhas[j] == true){
                    printf("%d ",j - 500000);
                    start = j - 1;
                    break;
                }
            }
        }
        for(int j = start;j >= end;j --){
            if(ifhas[j]){
                printf("%d\n",j - 500000);
                break;
            }
        }
    }
}