Submission #535857

#	Time	Username	Problem	Language	Result	Execution time	Memory
535857		cig32	Miners (IOI07_miners)	C++17	100 / 100	198 ms	109032 KiB

miners

#include <bits/stdc++.h>
using namespace std;
#define endl "\n"
typedef long long int ll;
const int N=1e5+7;
string s;
int n;
int c(int a,int b,int c){
	int sol = 0;
	if (a == 1 || b == 1 || c == 1) sol++;
	if (a == 2 || b == 2 || c == 2) sol++;
	if (a == 3 || b == 3 || c == 3) sol++;
	return sol;
}
 
int a[N];
int dp[N][4][4][4][4];
 
int solve(int idx,int prea1,int prea2,int preb1,int preb2){
	if(idx==n) {
		return 0;
	}
	int &ans=dp[idx][prea1][prea2][preb1][preb2];
	if(ans!=-1) return ans;
	int choice1=solve(idx+1,a[idx],prea1,preb1,preb2)+c(a[idx],prea1,prea2);
	int choice2=solve(idx+1,prea1,prea2,a[idx],preb1)+c(a[idx],preb1,preb2);
	return ans=max(choice1,choice2);
}
int main()
{
 
	ios_base:: sync_with_stdio(false); cin.tie(0);
	cin>>n;
 
	cin>>s;
	for(int i=0; i<n; i++) {
		if(s[i]=='B') {
			a[i]=3;
		}
		else if(s[i]=='M') {
			a[i]=1;
		}
		else{
			a[i]=2;
		}
	}
 
	memset(dp,-1,sizeof dp);
	int ans=solve(0,0,0,0,0);
	cout<<ans<<endl;
	return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 9 / 9
• Subtask 3: 9 / 9
• Subtask 4: 9 / 9
• Subtask 5: 9 / 9
• Subtask 6: 7 / 7
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 8 / 8
• Subtask 10: 8 / 8
• Subtask 11: 8 / 8
• Subtask 12: 8 / 8