题目链接：https://vjudge.net/contest/355760 password：123
HDU--2000:
#include<iostream>
#include<cstring>
#include<algorithm>
using namespace std;
const int MAX=1e5+10;
int a[MAX],n;
int main(){char ch[3];while(scanf("%s",ch)!=EOF){for(int i=0;i<3;i++)ch[i]=ch[i]-'0';sort(ch,ch+3);printf("%c %c %c\n",ch[0]+'0',ch[1]+'0',ch[2]+'0'); }return 0;
}
/*Sample Input
qwe
asd
zxc
Sample Output
e q w
a d s
c x z*/HDU--2001:
#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
#include<cmath>
using namespace std;
const int MAX=1e5+10;
int a[MAX],n;
int main(){float x1,x2,y1,y2;while(scanf("%f%f%f%f",&x1,&y1,&x2,&y2)!=EOF){printf("%.2f\n",sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)));}
}
/*Sample Input
0 0 0 1
0 1 1 0
Sample Output
1.00
1.41*/HDU--2002:
#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
#include<cmath>
using namespace std;
const int MAX=1e5+10;
#define PI 3.1415927
int a[MAX],n;
int main(){double c;while(scanf("%lf",&c)!=EOF){printf("%.3lf\n",4/3.0*PI*c*c*c);} return 0;
}/*Sample Input
1
1.5
Sample Output
4.189
14.137*/ HDU--2003:
#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
#include<cmath>
using namespace std;
const int MAX=1e5+10;
#define PI acos(-1)
int a[MAX],n;
int main(){double b;while(scanf("%lf",&b)!=EOF){if(b<=0)b=-b;printf("%.2lf\n",b);}return 0;
}
/*Sample Input
123
-234.00
Sample Output
123.00
234.00*/HDU--2004:
#include<iostream>
#include<cstring>
#include<cstdio>
#include<algorithm>
#include<cmath>
using namespace std;
const int MAX=1e5+10;
#define PI acos(-1)
int a[MAX],n;
int main(){double c;while(scanf("%lf",&c)!=EOF){if(c>=90&&c<=100) printf("A\n");else if(c>=80&&c<90)printf("B\n");else if(c<80&&c>=70)printf("C\n");else if(c<70&&c>=60)printf("D\n");else if(c>=0&&c<60)printf("E\n");else printf("Score is error!\n");} return 0;
}
/*Sample Input
56
67
100
123
Sample Output
E
D
A
Score is error!*/假期实在是太无聊了....