Submission #1144876

#	Time	Username	Problem	Language	Result	Execution time	Memory
1144876		SmuggingSpun	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++20	5 / 100	65 ms	7864 KiB

joi2019_ho_t3

#include<bits/stdc++.h>
#define taskname "C"
using namespace std;
int n;
string s;
namespace sub1{
	void solve(){
		unordered_map<string, int>f;
		f[s] = 1;
		queue<string>q;
		q.push(s);
		while(!q.empty()){
			s = q.front();
			q.pop();
			bool flag = true;
			for(int i = 1; i < n; i++){
				if(s[i] == s[i - 1]){
					flag = false;
					break;
				}
			}
			if(flag){
				return void(cout << f[s] - 1);
			}
			int N = f[s];
			for(int i = 1; i < n; i++){
				swap(s[i], s[i - 1]);
				if(f[s] == 0){
					f[s] = N + 1;
					q.push(s);
				}
				swap(s[i], s[i - 1]);
			}
		}
		cout << -1;
	}
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	cin >> n >> s;
	if(n <= 15){
		sub1::solve();
	}
	
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int main()':
joi2019_ho_t3.cpp:41:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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