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21 lines
580 B
21 lines
580 B
#include <bits/stdc++.h>
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using namespace std;
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double dis(int x1, int y1, int x2, int y2) {
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return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
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}
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int main() {
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int x1, y1, x2, y2, ans = 0;
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int y[105][3], n;
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cin >> n;
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for (int i = 0; i < 3; i++) //读入
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for (int j = 0; j < n; j++)
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cin >> y[j][i];
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cin >> x1 >> y1 >> x2 >> y2;
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for (int i = 0; i < n; i++)
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if (dis(x1, y1, y[i][0], y[i][1]) < y[i][2] != dis(x2, y2, y[i][0], y[i][1]) < y[i][2]) ans++; //计入总数
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cout << ans << endl; //输出
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return 0;
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} |