Submission #978157

#	Time	Username	Problem	Language	Result	Execution time	Memory
978157		phoenix0423	Miners (IOI07_miners)	C++17	100 / 100	44 ms	752 KiB

miners

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<double, ll> pdl;
typedef pair<ll, double> pld;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
#pragma GCC optimize("Ofast")
#define pb push_back
#define eb emplace_back 
#define f first
#define s second
// #define int long long
#define lowbit(x) x&-x
const int maxn = 1e3 + 5;
const int INF = 1e9;
map<char, int> mp = {{'M', 1}, {'F', 2}, {'B', 3}};
int dp[4][4][4][4], ndp[4][4][4][4];

int sol(int a, int b, int c){
	if(a == 0){
		if(b == 0) return 1;
		return 2 - (b == c);
	}
	return 3 - (a == c) - (b == c) - (a == b) + (a == c && b == c);
}

signed main(void){
	fastio;
	int n;
	cin>>n;
	string s;
	cin>>s;
	for(int i = 0; i <= 3; i++){
		for(int j = 0; j <= 3; j++){
			for(int k = 0; k <= 3; k++){
				for(int l = 0; l <= 3; l++){
					dp[i][j][k][l] = -INF;
				}
			}
		}
	}
	dp[0][0][0][0] = 0;
	for(auto x : s){
		for(int i = 0; i <= 3; i++){
			for(int j = 0; j <= 3; j++){
				for(int k = 0; k <= 3; k++){
					for(int l = 0; l <= 3; l++){
						ndp[i][j][k][l] = -INF;
					}
				}
			}
		}
		int c = mp[x];
		for(int i = 0; i <= 3; i++){
			for(int j = 0; j <= 3; j++){
				for(int k = 0; k <= 3; k++){
					for(int l = 0; l <= 3; l++){
						ndp[i][j][l][c] = max(ndp[i][j][l][c], dp[i][j][k][l] + sol(k, l, c));
					}
				}
			}
		}
		for(int j = 0; j <= 3; j++){
			for(int k = 0; k <= 3; k++){
				for(int l = 0; l <= 3; l++){
					for(int i = 0; i <= 3; i++){
						ndp[j][c][k][l] = max(ndp[j][c][k][l], dp[i][j][k][l] + sol(i, j, c));
					}
				}
			}
		}
		swap(dp, ndp);
	}
	int ans = 0;
	for(int i = 0; i <= 3; i++){
		for(int j = 0; j <= 3; j++){
			for(int k = 0; k <= 3; k++){
				for(int l = 0; l <= 3; l++){
					ans = max(ans, dp[i][j][k][l]);
				}
			}
		}
	}
	cout<<ans<<"\n";
}

• 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