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18 lines
382 B
C++
18 lines
382 B
C++
#include <cstdio>
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#include <cmath>
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int main()
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{
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int n, x0, y0, x, y, v;
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double ans = 1e16, tmp;
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scanf("%d%d%d", &x0, &y0, &n);
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for (int i = 0; i < n; i++)
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{
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scanf("%d%d%d", &x, &y, &v);
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x -= x0;
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y -= y0;
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tmp = sqrt(x*x + y*y) / v;
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if (tmp < ans) ans = tmp;
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}
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printf("%.10lf", ans);
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return 0;
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} |