46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
#include<map>
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#include<set>
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#include<cmath>
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#include<stack>
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#include<queue>
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#include<cstdio>
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#include<cctype>
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#include<vector>
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#include<cstring>
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#include<iostream>
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#include<algorithm>
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#include<functional>
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using namespace std;
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typedef long long LL;
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typedef pair<int, int> PII;
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const int MX = 1e5 + 5;
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double A[MX], B[MX];
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int main() {
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int T, n;
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scanf("%d", &T);
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while(T--) {
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scanf("%d", &n);
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for(int i = 1; i <= n; i++) {
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scanf("%lf", &A[i]);
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}
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for(int i = 1; i <= n; i++) {
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scanf("%lf", &B[i]);
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}
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double L = 0, R = 1000, m;
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for(int i = 1; i <= 40; i++) {
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m = (L + R) / 2;
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double s, sum1 = 0, sum2 = 0;
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for(int j = 1; j <= n; j++) {
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if(A[j] <= m) s = 0;
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else s = B[j] * B[j] * (A[j] - m) * (A[j] - m) * (A[j] - m) / (3.0 * A[j] * A[j]);
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sum1 += s;
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sum2 += B[j] * B[j] * A[j] / 3.0 - s;
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}
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if(sum1 < sum2) R = m;
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else L = m;
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}
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printf("%d\n", (int)m);
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}
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return 0;
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}
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