Submission #580484

#	Time	Username	Problem	Language	Result	Execution time	Memory
580484		pragmatist	Miners (IOI07_miners)	C++17	100 / 100	180 ms	101200 KiB

miners

/*#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("O3")
#pragma GCC target ("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("unroll-loops")*/

#include<bits/stdc++.h>

#define sz(v) (int)v.size()
#define ll long long
#define pb push_back
#define x first
#define y second
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define nl "\n"

using namespace std;
using pii = pair<int, int>;

const int N = (int)1e5 + 7;
const int inf = (int)1e9 + 7;
const ll INF = (ll)1e18 + 7;
const ll MOD = (ll)998244353;

pii dir[] = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};

int n, a[N], dp[N][4][4][4][4];
string s;       

void solve() {
	cin >> n >> s;
	for(int i = 1; i <= n; ++i) {
		if(s[i - 1] == 'M') a[i] = 1;
		if(s[i - 1] == 'F') a[i] = 2;
		if(s[i - 1] == 'B') a[i] = 3;
		for(int x = 0; x <= 3; ++x) {
			for(int y = 0; y <= 3; ++y) {
				for(int z = 0; z <= 3; ++z) {
					for(int w = 0; w <= 3; ++w) {
						dp[i][x][y][z][w] = -inf;	
					}
				}
			}
		}
	}
	dp[1][0][a[1]][0][0] = 1;
	dp[1][0][0][0][a[1]] = 1;
	for(int i = 1; i < n; ++i) {
		for(int x = 0; x <= 3; ++x) {
			for(int y = 0; y <= 3; ++y) {
				for(int w = 0; w <= 3; ++w) {
					for(int z = 0; z <= 3; ++z) {
						int dis = (x != y) + (a[i + 1] != x && a[i + 1] != y) + 1;
						int sid = (w != z) + (a[i + 1] != w && a[i + 1] != z) + 1;       
					    dis -= (x == 0 || y == 0);
					    sid -= (w == 0 || z == 0);
					    dp[i + 1][y][a[i + 1]][w][z] = max(dp[i + 1][y][a[i + 1]][w][z], dp[i][x][y][w][z] + dis);
					    dp[i + 1][x][y][z][a[i + 1]] = max(dp[i + 1][x][y][z][a[i + 1]], dp[i][x][y][w][z] + sid);
					}
				}
			}
		}				
	}            
	int ans = 0;
	for(int x = 0; x <= 3; ++x) {
		for(int y = 0; y <= 3; ++y) {
			for(int z = 0; z <= 3; ++z) {
				for(int w = 0; w <= 3; ++w) {
					ans = max(ans, dp[n][x][y][z][w]);
				}
			}
		}
	}
	cout << ans << nl;
}

signed main() {	
	ios_base::sync_with_stdio(NULL);
	cin.tie(0);
	cout.tie(0);
	int test = 1;
	//cin >> test;
	while(test--) {
		solve();
	}
	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