47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
#include<iostream>
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#include<sstream>
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#include<fstream>
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#include<vector>
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#include<list>
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#include<deque>
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#include<queue>
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#include<stack>
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#include<map>
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#include<set>
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#include<bitset>
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#include<algorithm>
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#include<cstdio>
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#include<cstdlib>
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#include<cstring>
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#include<cctype>
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#include<cmath>
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#include<ctime>
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#include<iomanip>
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using namespace std;
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const double eps(1e-8);
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typedef long long lint;
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const int maxn = 200 +5;
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pair<double,double>con[maxn];
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int main(){
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int n;
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while(cin >> n){
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for(int i = 1 ; i <= n ; i++) scanf("%lf%lf",&con[i].first,&con[i].second);
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int ans = 0;
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for(int i = 1 ; i <= n ; i++){
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for(int j = 1 ; j <= n ; j++){
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pair<double,double> t;
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t.first = (con[i].first + con[j].first) / 2.0;
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t.second = (con[i].second + con[j].second) / 2.0;
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int cnt = 0;
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for(int k = 1 ; k <= n ; k++){
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double dis = pow(t.first - con[k].first,2) + pow(t.second - con[k].second,2);
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if(dis <= 6.25 + eps) cnt++;
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}
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ans = max(ans , cnt);
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}
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}
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cout << ans << endl;
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}
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return 0;
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}
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