Submission #819135

#	Time	Username	Problem	Language	Result	Execution time	Memory
819135		vjudge1	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++17	0 / 100	1 ms	212 KiB

joi2019_ho_t3

#include <bits/stdc++.h>
#define ll long long 
#define pll pair<int, int>
#define pb push_back
#define fi first
#define se second
using namespace std;
const int MX=450;
int n, pref[MX], ans;
char c[MX];

int main(){
	cin >> n;
	for(int i=1; i<=n; i++){
		cin >> c[i];	
	}
	
	for(int i=1; i<n; i++){
//		cout << i << endl;
		if(c[i]!=c[i+1])continue;
		int idx=i;
		while(idx<=n && c[idx]==c[i]){
			idx++; 
		}
//		cout << idx << "  " << i+1 <<endl;
		if(idx>n) break;
		ans+=idx-(i+1);
		swap(c[idx], c[i+1]);
//		for(int j=1; j<=n; j++) cout << c[j]; cout << endl;
	}
	for(int i=n; i>=2; i--){
//		cout << i << endl;
		if(c[i]!=c[i-1])continue;
		int idx=i;
		while(idx>=1 && c[idx]==c[i]){
			idx--; 
		}
//		cout << idx << "  " << i-1 <<endl;
		if(idx<1) break;
		ans+=(i-1)-idx;
		swap(c[idx], c[i-1]);
//		for(int j=1; j<=n; j++) cout << c[j]; cout << endl;
	}
	//cek
	for(int i=2; i<=n; i++){
		if(c[i]==c[i-1]){
			cout << -1 << endl;
			return 0;
		}
	}
	cout << ans << endl;
	return 0;	
}

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