Submission #996812

#	Time	Username	Problem	Language	Result	Execution time	Memory
996812		onbert	JOIOJI (JOI14_joioji)	C++17	100 / 100	30 ms	6376 KiB

joioji

#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int n;
    cin >> n;
    string s;
    cin >> s;
    int ans = 0, J = 0, O = 0, I = 0;
    map<pair<int,int>, int> m;
    m[{0, 0}] = -1;
    for (int i=0;i<n;i++) {
        if (s[i]=='J') J++;
        if (s[i]=='O') O++;
        if (s[i]=='I') I++;
        if (!m.count({O-J, I-J})) m[{O-J, I-J}] = i;
        else ans = max(i - m[{O-J, I-J}], ans);
    }
    cout << ans << endl;
}

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