hdu2199 Can you solve this equation? (二分搜索)

#include <stdio.h>#include <math.h>int func(double x){return 8*x*x*x*x+7*x*x*x+2*x*x+3*x+6;}int main(){int n;double left,right,mid,Y;scanf("%d",&n);while(n--){scanf("%lf",&Y);if(Y>func(100)||Y<func(0))printf("No solution!\n");else{right=100.0;left=0.0;while((right-left)>1e-8){mid=(left+right)/2.0;if(func(mid)<Y)left=mid;elseright=mid;}printf("%.4lf\n",left);}}return 0;}