Submission #1148267

#	Time	Username	Problem	Language	Result	Execution time	Memory
1148267		why1	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++20	0 / 100	0 ms	328 KiB

joi2019_ho_t3

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

#define ll long long
#define pb push_back
#define pii pair<int,int>
#define sz size()
#define all(v) v.begin(),v.end()
#define fi first
#define se second

const int N = 1e5;
const int mod = 1e9+7;
const int INF = 1e9;

const int di[] = {1, -1, 0, 0};
const int dj[] = {0, 0, 1, -1};

int n;

int calc(string s){
	int ans=0;
	for(int i = 1; i <= n-1; i++){
		if(s[i]==s[i+1]){
			int pos=-1;
			for(int j = i+1; j <= n; j++){
				if(s[i]!=s[j]){
					pos=j;
					break;
				}
			}
			for(int j = pos-1; j >= i+1; j--){
				swap(s[j],s[j+1]);
				ans++;
			}
		}
	}
	for(int i = 1; i <= n-1; i++){
		if(s[i]==s[i+1]){
			return INF;
		}
	}
	return ans;
}

void solve() {
	string s;
	cin>>n>>s;
	reverse(all(s));
	string t=s;
	reverse(all(s));
	s="!"+s,t="!"+t;
	int ans=min(calc(s),calc(t));
	if(ans==INF)
		ans=-1;
	cout<<ans<<"\n";

}

int main() {

	//freopen("cowrun.in","r",stdin);
	//freopen("cowrun.out","w",stdout);

	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);

	int t=1;
	//cin>>t;
	while(t--) {
		solve();
	}
	return 0;
}

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