Submission #963386

#	Time	Username	Problem	Language	Result	Execution time	Memory
963386		Saul0906	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++14	20 / 100	1053 ms	600 KiB

joi2019_ho_t3

#include <bits/stdc++.h>
#define ll long long
#define rep(a,b,c) for(ll a=b; a<c; a++)
#define repr(a,b,c) for(ll a=b-1; a>c-1; a--)

using namespace std;

int n;
string s, s2;
int mn=1e9;

void solve(int k, int r, int y, int g, int l){
	if(y<0 || g<0 || r<0) return;
	if(!l) s2[k-1]='R';
	else if(l&1) s2[k-1]='Y';
	else s2[k-1]='G';
	if(k==n){
		int sum=0;
		string s3=s;
		rep(i,0,n){
			if(s2[i]==s3[i]) continue;
			rep(j,i,n){
				if(s3[j]==s2[i]){
					repr(k,j,i) swap(s3[k+1],s3[k]);
					sum+=(j-i);
					break;
				}
			}
		}
		mn=min(mn,sum);
		return;
	}
	if(!l) solve(k+1,r,y-1,g,1), solve(k+1,r,y,g-1,2);
	else if(l&1) solve(k+1,r-1,y,g,0), solve(k+1,r,y,g-1,2);
	else solve(k+1,r,y-1,g,1), solve(k+1,r-1,y,g,0);
}

int main(){
	cin>>n>>s;
	int r=0, g=0, y=0;
	rep(i,0,n){
		if(s[i]=='R') r++;
		if(s[i]=='G') g++;
		if(s[i]=='Y') y++;
	}
	s2=s;
	solve(1,r-1,y,g,0);
	solve(1,r,y-1,g,1);
	solve(1,r,y,g-1,2);
	if(n==1) mn=0;
	if(mn<1e9) cout<<mn<<endl;
	else cout<<-1<<endl;
}

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