CF993C Careful Maneuvering bitset_枚举

Code:

#include<cstdio>
#include<map>
#include<iostream>
#include<cmath>
#include<bitset>
using namespace std;
const int maxn = 100000 + 3;
map<double, int> idx;
int val[maxn], l[maxn], r[maxn], cnt;
bitset<130> Gleft[40000], Gright[40000];
inline double getinter(int a, int b){ return (double) min(a, b) + abs(a - b) / 2; }
int main(){
    int n, m;
    cin >> n >> m;
    for(int i = 1;i <= n; ++i)  scanf("%d",&l[i]);
    for(int i = 1;i <= m; ++i)  scanf("%d",&r[i]);
    for(int i = 1;i <= n; ++i)
        for(int j = 1;j <= m; ++j){
            double inter = getinter(l[i], r[j]);
            if(!idx[inter]) idx[inter] = ++cnt;
            Gleft[idx[inter]].set(i, 1);
            Gright[idx[inter]].set(j, 1);
        }
    int ans = 0;
    for(int i = 1;i <= cnt; ++i)
        for(int j = 1;j <= cnt; ++j)
        {
            bitset<130>A, B;
            A = Gleft[i] | Gleft[j];
            B = Gright[i] | Gright[j];
            int cur = A.count() + B.count();
            ans = max(ans, cur);
        }
    cout << ans;
    return 0;
}