19 lines
438 B
C++
19 lines
438 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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const double eps = 1e-8;
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int main() {
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double x;
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cin >> x;
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double l = -10000, r = 10000;
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while (r - l > eps) {
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double mid = (l + r) / 2; // 注意：浮点数这里不能用右移1位！！
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if (mid * mid * mid > x)
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r = mid; // mid>x后面没有"="
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else
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l = mid;
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}
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printf("%.6lf\n", l);
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return 0;
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}
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