Submission #818902

#	Time	Username	Problem	Language	Result	Execution time	Memory
818902		vjudge1	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++17	0 / 100	1 ms	212 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,ans;
string s;
bool b;
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> s;
	s = '!' + s;
	FOR(2,i,n) {
		if(s[i] == s[i-1]) {
			b = false;
			FOR(i+1,j,n) {
				if(s[j] != s[i]) {
					FORM(j,k,i+1) {
						swap(s[k],s[k-1]);
						ans++;
					}
					b = true;
					break;
				}
			}
			if(!b) {
				cout << -1 << endl;
				return 0;
			}
		}
	}
	cout << ans << endl;
}

/*
5
GGGRR
*/

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