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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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//cin读入优化
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std::ios::sync_with_stdio(false);
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double xa, ya, xb, yb, ab;
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cin >> xa >> ya >> xb >> yb;
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ab = sqrt((xa - xb) * (xa - xb) + (ya - yb) * (ya - yb));
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cout << fixed << setprecision(3) << ab << endl;
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return 0;
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} |
