Submission #819194

#	Time	Username	Problem	Language	Result	Execution time	Memory
819194		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], res;
vector<char>cc(MX), tmp;

int check1(vector<char>c){
	int ans=0;
	for(int i=1; i<n; i++){
		if(c[i]!=c[i+1])continue;
		int idx=i;
		while(idx<=n && c[idx]==c[i]){
			idx++; 
		}
		if(idx>n) break;
		ans+=idx-(i+1);
		swap(c[idx], c[i+1]);
	}
	for(int i=n; i>=2; i--){
		if(c[i]!=c[i-1])continue;
		int idx=i;
		while(idx>=1 && c[idx]==c[i]){
			idx--; 
		}
		if(idx<1) break;
		ans+=(i-1)-idx;
		swap(c[idx], c[i-1]);
	}
	for(int i=2; i<=n; i++){
		if(c[i]==c[i-1]){
//			cout << -1 << endl;
			return -1;
		}
	}
	return ans;
}

int check2(vector<char>c){
	int ans=0;
	for(int i=n; i>=2; i--){
		if(c[i]!=c[i-1])continue;
		int idx=i;
		while(idx>=1 && c[idx]==c[i]){
			idx--; 
		}
		if(idx<1) break;
		ans+=(i-1)-idx;
		swap(c[idx], c[i-1]);
	}
	for(int i=1; i<n; i++){
		if(c[i]!=c[i+1])continue;
		int idx=i;
		while(idx<=n && c[idx]==c[i]){
			idx++; 
		}
		if(idx>n) break;
		ans+=idx-(i+1);
		swap(c[idx], c[i+1]);
	}
	for(int i=2; i<=n; i++){
		if(c[i]==c[i-1]){
//			cout << -1 << endl;
			return -1;
		}
	}
	return ans;
}

int main(){
	cin >> n;
	for(int i=1; i<=n; i++){
		cin >> cc[i];	
	}
	tmp=cc;
	int ans=1e9;
//	cout << check1(cc) << "  " << check2(cc)<< endl;
	res=min(check1(cc), check2(cc));
	cout << res << endl;
	return 0;	
}

Compilation message (stderr)

joi2019_ho_t3.cpp: In function 'int main()':
joi2019_ho_t3.cpp:80:6: warning: unused variable 'ans' [-Wunused-variable]
   80 |  int ans=1e9;
      |      ^~~

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