HDU--2000-TO-2004--假期实在是太无聊了....

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....