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);
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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
2 100 -4 |
Sample Output
1.6152 No solution! |
Author
Redow
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Recommend
lcy
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#include<bits/stdc++.h> #define op 1e-8 using namespace std; double F(double x) { return 8*x*x*x*x+7*x*x*x+2*x*x+3*x+6; } 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<6||n>807020306) { puts("No solution!"); continue; } double l=0,r=100,mid; while(fabs(r-l)>op) { mid=(l+r)*1.0/2; if(F(mid)>n) r=mid; else l=mid; } printf("%.4lf ",l); } return 0; }