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22 lines
445 B
C++
22 lines
445 B
C++
#include <bits/stdc++.h>
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using namespace std;
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long long n, a[10000005], b[10000005], c[10000005], a1, b1, c1;
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int main() {
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cin >> n;
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for (int i = 0; i < n; i++) {
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cin >> a[i];
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a1 += a[i];
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}
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for (int i = 0; i < n; i++) {
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cin >> b[i];
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c[i] = a[i] - b[i];
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b1 += b[i];
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c1 += c[i];
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}
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cout << fixed << setprecision(6) << 1.00 * (a1 * 3 - b1 * 2) / c1 << endl;
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return 0;
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}
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