Submission #819196

#	Time	Username	Problem	Language	Result	Execution time	Memory
819196		vjudge1	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++17	0 / 100	2 ms	852 KiB

joi2019_ho_t3

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define endl "\n"
#define pii pair<ll,ll>
#define pb push_back
#define vi vector<ll>
#define pque priority_queue
#define pqueg priority_queue<ll,vector<ll>,greater<ll>>
#define que queue<ll>
#define FOR(m,i,n) for(int i=(m); i<=(n); i++)
#define FORM(m,i,n) for(int i=(m); i>=(n); i--)
#define all(v) sort(v.begin(),v.end())
ll n;
string s;
char c[4] = {'R', 'G', 'Y'};
map<string,bool> vis[405];
map<string,ll> memo[405];
ll dp(ll idx, string a) {
//	cout << idx << " " << a << endl;
	if(idx == n+1) {
		FOR(2,i,n) {
			if(a[i-1] == a[i]) return 1e9;
		}
		return 0;
	}
	if(!vis[idx][a]) {
		vis[idx][a] = true;
		memo[idx][a] = 1e9;
		if(a[idx] != a[idx-1]) memo[idx][a] = dp(idx+1,a);
		FOR(0,l,2) {
//			if(idx == 1) {
//				cout << "warna " << c[l] << endl;
//			}
			if(a[idx] != c[l] && a[idx-1] != c[l]) {
				FOR(idx+1,i,n) {
					if(s[i] == c[l]) {
						string s1 = a;
						FORM(i,j,idx+1) {
							swap(s1[j],s1[j-1]);
						}
//						cout << "DEBUG " << temp << endl;
//						cout << "string  " << s1 << endl;
						memo[idx][a] = min(memo[idx][a],dp(idx+1,s1)+(i-idx));
						break;
					}
				}
			}
		}
	}
//	cout << "memo " << memo[idx][a] << endl;
	return memo[idx][a];
}
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> s;
	s = '!' + s;
	if(dp(1,s) == 1e9) cout << -1 << endl;
	else cout << dp(1,s) << endl;
}

/*
5
GGGRR

7
GGRRGRR

*/

• Subtask 1: 0 / 5
• Subtask 2: 0 / 55
• Subtask 3: 0 / 15
• Subtask 4: 0 / 25