Submission #227130

#	Time	Username	Problem	Language	Result	Execution time	Memory
227130		maruii	JJOOII 2 (JOI20_ho_t2)	C++14	100 / 100	10 ms	2044 KiB

ho_t2

#include <bits/stdc++.h>
using namespace std;
#define eack emplace_back

int N, K;
char S[200005];
vector<int> J, O, I;
int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	cin >> N >> K >> S + 1;
	for (int i = 1; i <= N; ++i) {
		if (S[i] == 'J') J.eack(i);
		if (S[i] == 'O') O.eack(i);
		if (S[i] == 'I') I.eack(i);
	}
	int ans = N;
	for (int i = 0, j = 0, k = 0; i + K - 1 < O.size(); ++i) {
		while (j + K < J.size() && J[j + K] < O[i]) ++j;
		while (k + K < I.size() && I[k] < O[i + K - 1]) ++k;
		if (J[j + K - 1] < O[i] && O[i + K - 1] < I[k]) ans = min(ans, I[k + K - 1] - J[j] + 1 - 3 * K);
	}
	if (ans == N) ans = -1;
	cout << ans;
	return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:10:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  cin >> N >> K >> S + 1;
                   ~~^~~
ho_t2.cpp:17:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0, j = 0, k = 0; i + K - 1 < O.size(); ++i) {
                                ~~~~~~~~~~^~~~~~~~~~
ho_t2.cpp:18:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while (j + K < J.size() && J[j + K] < O[i]) ++j;
          ~~~~~~^~~~~~~~~~
ho_t2.cpp:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while (k + K < I.size() && I[k] < O[i + K - 1]) ++k;
          ~~~~~~^~~~~~~~~~

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