Submission #173428

#	Time	Username	Problem	Language	Result	Execution time	Memory
173428		jhwest2	JOIOJI (JOI14_joioji)	C++14	100 / 100	46 ms	6276 KiB

joioji

#include <bits/stdc++.h>
#define va first
#define vb second
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;

int N;
string s;
map<pii, int> mp;
int main() {
	cin.tie(0); ios_base::sync_with_stdio(0);

	cin >> N >> s;

	int ans = 0;
	pii ret = {0, 0}; mp[ret] = 0;
	for (int i=0; i<s.size(); i++) {
		if (s[i] == 'J') ++ret.va, ++ret.vb;
		if (s[i] == 'O') --ret.va;
		if (s[i] == 'I') --ret.vb;

		if (mp.find(ret) == mp.end()) mp[ret] = i+1;
		else ans = max(ans, i+1 - mp[ret]);
	}

	cout << ans;
}

Compilation message (stderr)

joioji.cpp: In function 'int main()':
joioji.cpp:18:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0; i<s.size(); i++) {
                ~^~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 80 / 80