Can you solve this equation? |
| Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) |
| Total Submission(s): 1182 Accepted Submission(s): 558 |
|
Problem Description
Now,given the equation 8*x^4 + 7*x^3 + 2*x^2 + 3*x + 6 == Y,can you find its solution between 0 and 100;
Now please try your lucky. |
|
Input
The first line of the input contains an integer T(1<=T<=100) which means the number of test cases. Then T lines follow, each line has a real number Y (fabs(Y) <= 1e10);
|
|
Output
For each test case, you should just output one real number(accurate up to 4 decimal places),which is the solution of the equation,or “No solution!”,if there is no solution for the equation between 0 and 100.
|
|
Sample Input
2 |
|
Sample Output
1.6152 |
|
Author
Redow
|
|
Recommend
lcy
|
#include<bits/stdc++.h>
#define op 1e-8
using namespace std;
double F(double x)
{
return *x*x*x*x+*x*x*x+*x*x+*x+;
}
int main()
{
//freopen("C:\\Users\\acer\\Desktop\\in.txt","r",stdin);
int t;
double n;
scanf("%d",&t);
while(t--)
{
scanf("%lf",&n);
if(n<||n>)
{
puts("No solution!");
continue;
}
double l=,r=,mid;
while(fabs(r-l)>op)
{
mid=(l+r)*1.0/;
if(F(mid)>n)
r=mid;
else
l=mid;
}
printf("%.4lf\n",l);
}
return ;
}