两点间的距离
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#include <cstdio>
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#include <cmath>
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int main()
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{
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double x1, y1, x2, y2;
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scanf("%lf%lf", &x1, &y1);
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scanf("%lf%lf", &x2, &y2);
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printf("%.4lf\n",sqrt(pow((x1-x2),2)+pow((y1-y2),2)));
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return 0;
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}
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