Submission #849755

#	Time	Username	Problem	Language	Result	Execution time	Memory
849755		Abito	Monochrome Points (JOI20_monochrome)	C++17	4 / 100	2027 ms	348 KiB

monochrome

#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
#define int long long
#define y1 YONE
typedef unsigned long long ull;
using namespace std;
int n;
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    vector<int> a,b;
    cin>>n;
    for (int i=0;i<2*n;i++){
        char c;cin>>c;
        if (c=='W') a.pb(i);
        else b.pb(i);
    }int ans=0;
    do{
        int x=0;
        for (int i=0;i<n;i++){
            for (int j=i+1;j<n;j++){
                int x1=b[i],y1=a[i],x2=b[j],y2=a[j];
                if (x1>y1) swap(x1,y1);
                if (x2>y2) swap(x2,y2);
                x+=(bool(x2<y1 && x2>x1)+bool(y2<y1 && y2>x1))%2;
            }
        }ans=max(ans,x);
    }while (next_permutation(a.begin(),a.end()));
    cout<<ans<<endl;
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 21
• Subtask 3: 0 / 10
• Subtask 4: 0 / 65