Submission #203223

#	Time	Username	Problem	Language	Result	Execution time	Memory
203223		staniewzki	JJOOII 2 (JOI20_ho_t2)	C++14	100 / 100	11 ms	1916 KiB

ho_t2

#include<bits/stdc++.h>
using namespace std;
 
ostream& operator<<(ostream &out, string str) {
	for(char c : str) out << c;
	return out;
}
 
template<class L, class R> ostream& operator<<(ostream &out, pair<L, R> p) {
	return out << "(" << p.first << ", " << p.second << ")";
}
 
template<class T> auto operator<<(ostream &out, T a) -> decltype(a.begin(), out) {
	out << "{";
	for(auto it = a.begin(); it != a.end(); it = next(it))
		out << (it != a.begin() ? ", " : "") << *it;
	return out << "}";
}
 
void dump() { cerr << "\n"; }
template<class T, class... Ts> void dump(T a, Ts... x) {
	cerr << a << ", ";
	dump(x...);
}
 
#ifdef DEBUG
#  define debug(...) cerr << "[" #__VA_ARGS__ "]: ", dump(__VA_ARGS__)
#else
#  define debug(...) false
#endif
 
#define REP(i, n) for(int i = 0; i < n; i++)
#define FOR(i, a, b) for(int i = a; i <= b; i++)
#define ST first
#define ND second
 
template<class T> int size(T && a) { return a.size(); }
 
using LL = long long;
using PII = pair<int, int>;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	int n, k;
	string str;
	cin >> n >> k >> str;

	vector<vector<int>> pos(3);
	vector<int> last(4, -1e9);
	map<char, int> id = {{'J', 0}, {'O', 1}, {'I', 2}};
	int ans = 1e9;

	REP(i, n) {
		last[0] = i;
		int x = id[str[i]];
		pos[x].emplace_back(last[x]);
		if(size(pos[x]) >= k)
			last[x + 1] = pos[x][size(pos[x]) - k];
		ans = min(ans, i - last[3] + 1 - 3 * k);
	}

	if(ans > n) ans = -1;
	cout << ans << "\n";
}

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