Solve It UVA

Solve the equation:
p ∗ e
−x + q ∗ sin(x) + r ∗ cos(x) + s ∗ tan(x) + t ∗ x
2 + u = 0
where 0 ≤ x ≤ 1.
Input
Input consists of multiple test cases and terminated by an EOF. Each test case consists of 6 integers in
a single line: p, q, r, s, t and u (where 0 ≤ p, r ≤ 20 and −20 ≤ q, s, t ≤ 0). There will be maximum
2100 lines in the input file.
Output
For each set of input, there should be a line containing the value of x, correct up to 4 decimal places,
or the string ‘No solution’, whichever is applicable.
Sample Input
0 0 0 0 -2 1
1 0 0 0 -1 2
1 -1 1 -1 -1 1
Sample Output
0.7071
No solution

0.7554

二分枚举x

#include<stdio.h>#include<math.h>int p,q,r,s,t,u;double check(double x){    return p*exp(-x)+q*sin(x)+r*cos(x)+s*tan(x)+t*x*x+u;}int main(){    while(~scanf("%d%d%d%d%d%d",&p,&q,&r,&s,&t,&u))    {        double high=1,low=0,mid;        while(high-low>1e-8)        {            mid=(high+low)/2;            if(check(mid) > 0)                low=mid;            else                high=mid;        }        if(fabs(check(mid)-0.0)<1e-6)            printf("%.4f\n",mid);        else            printf("No solution\n");    }    return 0;}