Submission #502576

#	Time	Username	Problem	Language	Result	Execution time	Memory
502576		amunduzbaev	Monochrome Points (JOI20_monochrome)	C++14	25 / 100	2015 ms	352 KiB

monochrome

#include "bits/stdc++.h"
using namespace std;

#define ar array

signed main(){
	ios::sync_with_stdio(0); cin.tie(0);
	
	int n; cin>>n;
	string s; cin>>s;
	ar<vector<int>, 2> p;
	for(int i=0;i<2*n;i++){
		p[s[i] == 'B'].push_back(i);
	}
	
	int rr = 0;
	for(int k=0;k<n;k++){
		vector<ar<int, 2>> a(n);
		int res = 0;
		for(int i=0;i<n;i++){
			int j = (i + k) % n;
			a[i] = {p[0][i], p[1][j]};
			if(a[i][0] > a[i][1]) swap(a[i][0], a[i][1]);
		}
		
		auto check = [&](ar<int, 2> a, ar<int, 2> b){
			if(a[0] < b[0] && b[1] < a[1]) return;
			if(b[0] < a[0] && a[1] < b[1]) return;
			res += (max(a[0], b[0]) < min(a[1], b[1]));
		};
		
		for(int i=0;i<n;i++){
			for(int j=i+1;j<n;j++){
				check(a[i], a[j]);
			}
		}
		
		rr = max(rr, res);
	}
	
	cout<<rr<<"\n";
}

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