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Xiao Ming is a citizen who‘s good at playing,he has lot‘s of gold cones which have square undersides,let‘s call them pyramids. Anyone of them can be defined by the square‘s length and the height,called them width and height. To easily understand,all the units are mile.Now Ming has n pyramids,there height and width are known,Xiao Ming wants to make them again to get two objects with the same volume. Of course he won‘t simply melt his pyramids and distribute to two parts.He has a sword named "Tu Long" which can cut anything easily. Now he put all pyramids on the ground (the usdersides close the ground)and cut a plane which is parallel with the water level by his sword ,call this plane cutting plane. Our mission is to find a cutting plane that makes the sum of volume above the plane same as the below,and this plane is average cutting plane.Figure out the height of average cutting plane.
First line: T, the number of testcases.(1≤T≤100) Then T testcases follow.In each testcase print three lines : The first line contains one integers n(1≤n≤10000), the number of operations. The second line contains n integers A1,…,An(1≤i≤n,1≤Ai≤1000) represent the height of the ith pyramid. The third line contains n integers B1,…,Bn(1≤i≤n,1≤Bi≤100) represent the width of the ith pyramid.
For each testcase print a integer - **the height of average cutting plane**. (the results take the integer part,like 15.8 you should output 15)
2 2 6 5 10 7 8 702 983 144 268 732 166 247 569 20 37 51 61 39 5 79 99
1 98
1 #pragma comment(linker, "/STACK:1024000000,1024000000") 2 #include<iostream> 3 #include<cstdio> 4 #include<cstring> 5 #include<cmath> 6 #include<math.h> 7 #include<algorithm> 8 #include<queue> 9 #include<set> 10 #include<bitset> 11 #include<map> 12 #include<vector> 13 #include<stdlib.h> 14 using namespace std; 15 #define ll long long 16 #define eps 1e-10 17 #define MOD 1000000007 18 #define N 10006 19 #define inf 1e12 20 int n; 21 double h[N]; 22 double w[N]; 23 double q; 24 bool solve(double x){ 25 double sum=0; 26 for(int i=0;i<n;i++){ 27 double wh=h[i]-x; 28 if(wh>0){ 29 double p=wh/h[i]; 30 double ww=p*w[i]; 31 double ans=ww*ww*wh/3.0; 32 sum+=ans; 33 } 34 35 } 36 if(sum>=q) return true; 37 return false; 38 } 39 int main() 40 { 41 int t; 42 scanf("%d",&t); 43 while(t--){ 44 scanf("%d",&n); 45 for(int i=0;i<n;i++){ 46 scanf("%lf",&h[i]); 47 } 48 for(int i=0;i<n;i++){ 49 scanf("%lf",&w[i]); 50 } 51 q=0; 52 for(int i=0;i<n;i++){ 53 q=q+w[i]*w[i]*h[i]/3.0; 54 } 55 q=q/2.0; 56 double low=0; 57 double high=1001; 58 for(int i=0;i<100;i++){ 59 double mid=(low+high)/2; 60 if(solve(mid)){ 61 low=mid; 62 } 63 else{ 64 high=mid; 65 } 66 } 67 printf("%d\n",(int)low); 68 } 69 70 return 0; 71 }
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原文地址：http://www.cnblogs.com/UniqueColor/p/4803717.html
