Submission #860999

#	Time	Username	Problem	Language	Result	Execution time	Memory
860999		phoenix0423	JJOOII 2 (JOI20_ho_t2)	C++17	0 / 100	0 ms	348 KiB

ho_t2

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pll;
#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 lowbit(x) x&-x
const int maxn = 4e5 + 5;
const int INF = 1e9;

int main(void){
	fastio;
	int n, k;
	cin>>n>>k;
	string s;
	cin>>s;
	int r1, r2, r3;
	vector<int> cnt(3);
	for(r1 = 0; r1 < n; r1++){
		if(s[r1] == 'J'){
			cnt[0] ++;
			if(cnt[0] == k) break;
		} 
	}
	for(r2 = r1 + 1; r2 < n; r2++){
		if(s[r2] == 'O'){
			cnt[1]++;
			if(cnt[1] == k) break;
		}
	}
	for(r3 = r2 + 1; r3 < n; r3++){
		if(s[r3] == 'I'){
			cnt[2]++;
			if(cnt[2] == k) break;
		}
	}
	if(r3 >= n){
		cout<<-1<<"\n";
		return 0;
	}
	int ans = (r3 + 1) - k * 3;
	for(int i = 0; i < n; i++){
		if(s[i] == 'J') cnt[0] --;
		while(cnt[0] < k && r1 < n){
			if(s[r1 + 1] == 'O' && r1 + 1 <= r2) cnt[1] --;
			if(s[r1 + 1] == 'I' && r1 + 1 > r2 && r1 + 1 <= r3) cnt[2] --;
			if(s[r1 + 1] == 'J') cnt[0] ++;
			r1++;
		}
		r2 = max(r2, r1 + 1);
		while(cnt[1] < k && r2 < n){
			if(s[r2 + 1] == 'O') cnt[1] ++;
			if(s[r2 + 1] == 'I' && r2 + 1 <= r3) cnt[2] --;
			r2++;
		}
		r3 = max(r3, r2 + 1);
		while(cnt[2] < k && r3 < n){
			if(s[r3 + 1] == 'J') cnt[2] ++;
			r3++;
		}
		if(r3 >= n) break;
		ans = min(ans, (r3 - i) - 3 * k);
	}
	cout<<ans<<"\n";
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 12
• Subtask 3: 0 / 87