精度小一点就能过
#include<bits/stdc++.h> #define maxn 1000000009 #define esp 1e-9 #define PI 3.1415926535897932384626 using namespace std; double r,R,H,V,V1,h1,R1; double func(double h1){ R1=r+(h1/H)*(R-r); V1=((double)1/3)*PI*h1*(R1*R1+r*r+R1*r); return V1; } int main(){ int t; scanf("%d",&t); while(t--){ scanf("%lf%lf%lf%lf",&r,&R,&H,&V); double ll=0,rr=H; while(abs(rr-ll)>esp){ h1=(ll+rr)/2; if(func(h1)<V) ll=h1; else rr=h1; } printf("%.6lf\n",(ll+rr)/2); } }
转载于:https://www.cnblogs.com/zsben991126/p/10144344.html
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