算法笔记codeup-Contest100000567

A   

 1 #include <stdio.h>
 2 #include <math.h>
 3 int main()
 4 {
 5     double a=0;
 6     double b=0;
 7     double c=0;
 8     scanf("%lf%lf%lf",&a,&b,&c);
 9     if((b*b-4*a*c)>=0)
10     {
11     double r1=(-b+sqrt(b*b-4*a*c))/(2*a);
12     double r2=(-b-sqrt(b*b-4*a*c))/(2*a);
13     printf("r1=%7.2f
",r1);
14     printf("r2=%7.2f",r2);
15     }
16     else{
17         printf("No real roots!");
18     }
19   
20     return 0;
21 }

B

 1 #include <stdio.h>
 2 int main()
 3 {   
 4     float a=0;
 5     float b=0;
 6     scanf("%f%f",&a,&b);
 7     if(a<b)
 8     {
 9         printf("%.2f %.2f",a,b);
10     }
11     else
12     {
13         printf("%.2f %.2f",b,a);
14     }
15     return 0;
16 }

C

 1 #include <stdio.h>
 2 int main()
 3 {
 4     float a=0;
 5     float b=0;
 6     float c=0;
 7     float tem=0;
 8     scanf("%f%f%f",&a,&b,&c);
 9     if(b<a)
10      {
11          tem=a;
12          a=b;
13          b=tem;
14      }
15     if(c<a)
16      {
17          tem=a;
18          a=c;
19          c=tem;
20      }
21      if(c<b)
22      {
23          tem=b;
24          b=c;
25          c=tem;
26      }
27      printf("%.2f %.2f %.2f",a,b,c);
28      return 0;
29 }

D

 1 #include <stdio.h>
 2 int main()
 3 {
 4     int a=0;
 5     int b=0;
 6     int c=0;
 7     int tmp=0;
 8     scanf("%d%d%d",&a,&b,&c);
 9     if(a>c)
10     {
11         tmp=a;
12         a=c;
13         c=tmp;
14     }
15     if(b>c)
16     {
17         tmp=b;
18         b=c;
19         c=tmp;
20     }
21     printf("%d",c);
22 }

E

 1 #include <stdio.h>
 2 
 3 int main()
 4 {
 5     double money=0;
 6     double praise=0;
 7     scanf("%lf",&money);
 8     if(money<=100000)
 9     {
10         praise=money*0.1;
11     }
12     else if(money<=200000)
13     {
14         praise=100000*0.1+(money-100000)*0.075;
15     }
16     else if(money<=400000)
17     {
18         praise=100000*0.1+100000*0.075+(money-200000)*0.05;
19     }    
20     else if(money<=600000)
21     {
22         praise=100000*0.1+100000*0.075+200000*0.05+(money-400000)*0.03;
23     }
24     else if(money<=1000000)
25     {
26         praise=100000*0.1+100000*0.075+200000*0.05+200000*0.03+(money-600000)*0.015;
27     }
28     else
29     {
30         praise=100000*0.1+100000*0.075+200000*0.05+200000*0.03+400000*0.015+(money-1000000)*0.01;
31     }
32     printf("%.2lf",praise); 
33 }