Submission #1267917

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267917		_rain_	Vim (BOI13_vim)	C++20	0 / 100	14 ms	2120 KiB

vim

#include<bits/stdc++.h>
using namespace std;
typedef long long LL;

#define FOR(i,a,b) for(int i = (a) , _b = (b); i <= _b; ++i)
#define BIT(mask , x) (((mask) >> (x)) & (1))
#define MASK(x) ((LL)(1) << (x))
#define sz(x) (int)(x).size()
#define TIME_USED cerr << "\n Time lapsed : " << 1.0 * clock() / CLOCKS_PER_SEC << "s \n";

template<class T1 , class T2>
	bool maximize(T1 &a , T2 b){
		if (a < b) return a = b , true; else return false;
	}
template<class T1 , class T2>
	bool minimize(T1 &a , T2 b){
		if (a > b) return a = b , true; else return false;
	}
template<class T1 , class T2>
	T2 Find(const vector<T1>&data , T2 y){
		return upper_bound(data.begin() , data.end() , y) - data.begin();
	}
template<class T>
	void compress(vector<T>&data){
		sort(data.begin() , data.end());
		data.resize(unique(data.begin() , data.end()) - data.begin());
	}
	
const int N = (int) 7e4;
const int inf = (int) 1e9;
const int MAXK = (int) 11;
const int const_id = 4;
	vector<int> occur[MAXK + 2];
	int a[N + 2];
	string s;
	int n;
	
	int Find_nxt(int c , int x){
		int tt = lower_bound(occur[c].begin() , occur[c].end() , x) - occur[c].begin();
		--tt;
		if (tt == -1) return tt;
		return occur[c][tt];
	}
	
	
//... ARRAY FOR PROCESSING
	int dp[N + 2][2] = {};	
	int rig[N + 2] = {};
	int pre[N + 2] = {};
	
	int Get_prefix(int l , int r){
		return pre[r] - pre[l - 1];
	}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0) ; cout.tie(0) ; 
	#define name "main"
		if (fopen(name".inp","r")){
			freopen(name".inp","r",stdin);
			freopen(name".out","w",stdout);
		}
		
		cin >> n >> s;
		s = '#' + s;
		for(int i = 1; i <= n; ++i) a[i] = (int)s[i] - 'a';
		for(int i = 1; i <= n; ++i) occur[a[i]].push_back(i);
		//... PRE BUILD
			rig[n + 1] = n + 1;
			for(int i = n; i >= 1; --i){
				if (a[i] == const_id) rig[i] = i; else rig[i] = rig[i + 1];
			}
			for(int i = 1; i <= n; ++i) pre[i] = pre[i - 1] + (a[i] == const_id);
		
		int start = 1 , ans = 0;
		memset(dp , 0x3f , sizeof dp);
		dp[start][1] = dp[start][0] = ans;
		for(int i = start; i <= n; ++i){
			if (a[i] == const_id) continue;
			for(int j = 0; j <= MAXK; ++j){
				if (j == const_id) continue;
				int t = Find_nxt(j , i);
				if (t == -1) continue;
				int last_ptr = min(rig[t] , i);
				minimize(dp[i][0] , dp[t][1] + 2 + Get_prefix(t , i) + i - last_ptr);
			}
			minimize(dp[i][1] , dp[i][0]);
		}
		ans = inf;
		for(int i = 1; i <= n; ++i) if (pre[i] == pre[n]) minimize(ans , dp[i][1]);
		cout << ans;
		
	return 0;
}

Compilation message (stderr)

vim.cpp: In function 'int main()':
vim.cpp:60:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |                         freopen(name".inp","r",stdin);
      |                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
vim.cpp:61:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |                         freopen(name".out","w",stdout);
      |                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 50
• Subtask 2: 0 / 10
• Subtask 3: 0 / 40